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00:00Before starting web development, there are some basic things that if we understand,
00:05then the journey of web development will become more intuitive and easy.
00:09The first thing that we are going to understand is our internet.
00:13Internet is such a thing that we use on phones, laptops, computers.
00:17But how does internet work exactly?
00:20We are not going to go deep into the working of internet.
00:24We are going to take a very basic overview,
00:26so that we can understand things from above.
00:29First of all, let's talk about the basic definition of internet.
00:32If we want to summarize internet,
00:35it means interconnected network of computers around the world.
00:39The whole world of computers means a system.
00:44Our laptop can also come to the system.
00:47Our phone can also come to the system.
00:49Whatever machine or device that can be connected through internet,
00:52we are calling computers here.
00:54When computers are connected to the world,
00:57we are creating a network of computers,
00:59which are many interconnected computers.
01:01And we call this network of internet.
01:04Now, let's understand this very basic.
01:06If I have two computers in one camera,
01:09let's call it A.
01:10Let's call it A.
01:12And if I have another computer in the camera,
01:16it's called B.
01:18Now, if I want to connect these two computers,
01:20what can we do to connect?
01:22We can take one wire,
01:23which we can connect to another computer to another computer.
01:26Like we have connected both computers,
01:28and then connect to another computer.
01:30It will be easy to transfer data from another computer.
01:32You can send A computer to B computer to B computer.
01:34You can send B computer to A computer.
01:35You can send B computer to A computer.
01:37You can send B computer to A computer.
01:38So, in this way,
01:39we can say that these two computers
01:41will be able to talk to each other.
01:42Now, if we replicate this thing a lot,
01:44duplicate, duplicate, multiply,
01:46then we call it internet.
01:48We call it internet.
01:49So, this is a long wire,
01:51which has a network of computers
01:55and there are many interconnected devices.
01:57We call it internet.
01:59So, how does internet come to our house?
02:01We use cables to our house.
02:04So, whenever we have Wi-Fi, router,
02:06or devices, we have to use internet.
02:08We always have to connect to the company
02:10from outside.
02:12In this way,
02:13there are large cables
02:15which are inter-connected from one place to the other.
02:19So, if there is also an ocean,
02:21there are small wires from the ocean
02:24which are transferred to internet.
02:27So, computers are inter-connected from one continent
02:30which are inter-connected from the other continent.
02:33So, there is such a big network
02:35which works on global levels
02:37which is connected to the entire earth.
02:40So, this is a little magical concept
02:42which is coming out
02:43if we actually think about internet working.
02:45Now, we will not go into so much detail
02:47but if we have clear overview,
02:49it will be easy.
02:50So, whenever we have to imagine the internet
02:52we have to imagine that
02:54one place of computers
02:56and all other computers
02:58are inter-connected.
02:59It has become a connection
03:01and they are able to communicate with other computers.
03:03Now, if in this whole network
03:05I need a special computer
03:08which is always 24-7 online.
03:12I mean, my computer
03:14in my home
03:15I can always switch off
03:17or switch on
03:18but if in my whole network
03:20there is a special computer
03:22which is always online
03:24which never switch off
03:25and this computer
03:26is a basic work
03:27is a basic work
03:28that if there is any data
03:29that has it
03:30then it will return
03:31that data
03:32properly.
03:33That means,
03:34if this computer
03:35wants any data from this computer
03:37then this computer
03:38is the work
03:39to return that data
03:40to this computer.
03:41So, we can say
03:42that my special computer
03:43is a server.
03:45So, when you hear the word
03:47once again
03:48it means that
03:49we have a device
03:50or a system
03:51that is always online
03:53and has the data
03:54that has the data
03:55it will return
03:56to another computer
03:57back to another computer
03:58through the internet
03:59and this machine
04:01which is actually
04:02that data
04:03we call this machine
04:04client.
04:05Client
04:06can be any computer
04:07but if this computer
04:08will need data
04:09then it will become
04:10a client
04:11and if this computer
04:12will need data
04:13then it will become
04:14that data
04:16means that
04:17if we have searched
04:18on the internet
04:19then it will also
04:20need data
04:21and we want
04:22to answer our query
04:23or if we are searching
04:24for a website
04:25then we want
04:26to see that website
04:27that is the data
04:28that is the data
04:29that is the data
04:30so, when we get
04:31that thing
04:32means that
04:33the request of client
04:34has been served
04:35in this case
04:36in this case
04:37we search on Google
04:38or Amazon
04:39or Flipkart
04:40then we become
04:41a client
04:42or we can say
04:43that our system
04:44like our laptop
04:45or our computer
04:46or our phone
04:47that is a client
04:48so, two important things
04:49that we should
04:50remember
04:51one is our client
04:52and one is our server
04:53client
04:54client is to ask information
04:55and the server
04:56is to send information
04:57and the server
04:58is to send information
04:59and the servers
05:0024x7
05:01are on-line
05:02So, now
05:04every computer
05:05and an internet
05:06has a unique
05:07IP адres
05:10as this computer
05:12will be another IP
05:13address
05:14to come
05:15and our server
05:17will be another IP
05:18address
05:19and our server
05:20will be another IP
05:21address
05:22that
05:23we have a lot of plots
05:25There are many plots. Now, every plot has a unique address, whether you take a example of Delhi, Mumbai or Gujarat.
05:33Every place, if there is a land, there will be a official address. It may be that the land is only a empty plot.
05:40It may be that there are apartments or bungalow. But every plot of land has an official address.
05:48In the same way, the internet has an unique address.
05:53Your computer has an unique address. My laptop has an unique address.
05:57And with these addresses, we know that we are dealing with which device.
06:02So, every server has a unique IP address.
06:06So, if you watch hacking and movies, it usually shows that they track the IP address from there,
06:13which one computer has been sent from there.
06:17Or, which one computer has been conducted by hacking.
06:20Because every device has a unique IP address, which is trackable on the internet.
06:27Now, let's talk about how the internet works exactly.
06:31Now, when we have a client, or any computer, you can also have a client, or I can also have a client.
06:36The client is basically the computer that wants to use the internet,
06:40or search for the internet, or browse for the internet.
06:42Now, let's assume that the client has a request.
06:45Now, this request can also be something.
06:46It may be that if we have a client,
06:48we want to search for Amazon or Google.
06:50Or, we want to search for Google.
06:53So, when we search for any website,
06:57our request goes to our internet service provider.
07:02It may be that we don't hear ISP's name,
07:04but we have Airtel, Jio, Vodafone, Airtel.
07:07These are different companies.
07:10These companies are our internet service providers.
07:13We provide internet service providers.
07:16We can work on our phone, laptop, computer, internet service.
07:20Because Airtel is giving us the internet,
07:22or Jio is giving us the internet,
07:24or any other company is providing us the internet.
07:26So, first of all,
07:28our request goes to our ISP.
07:30If I have Google search for my college.in,
07:33then, first of all,
07:35if I use Jio in my phone,
07:37then Jio will request the request.
07:39Then, what do Jio,
07:41or what is my ISP?
07:43It goes to DNS.
07:45It means domain name system.
07:48Domain name system,
07:50we can understand it in a dictionary.
07:52In the dictionary,
07:53there are many words that are stored in their meaning.
07:56In the dictionary,
07:57there are many information stored in DNS.
07:59Or, if we imagine it as an address book.
08:02When we were very small,
08:03when we have mobile phones, internet,
08:05computers, laptops,
08:06all of this was not happening.
08:07In our grandfather's generation.
08:09So, what was that?
08:10People had an address book.
08:11What was that?
08:12What was in the address book?
08:13You could search by name,
08:14any person's phone number,
08:16and its address.
08:17So, if you make a little digital book,
08:19if you make a little digital book,
08:21then we will call it DNS.
08:22What is in DNS?
08:23What is in DNS?
08:24All the domain names,
08:26such as Google.com, Amazon.com, Amazon.in,
08:30and Quora,
08:32or LinkedIn.com, Facebook.com, Instagram.
08:35These all the websites we know,
08:38which we search on the links,
08:40on Google or any browser,
08:42we can call them domain.
08:44And all the domain names,
08:46the IP address,
08:47the server's IP address,
08:49its data is stored on this DNS.
08:52This means,
08:53you know,
08:54Google.com,
08:55the server's IP address,
08:57or Amazon.com,
09:00the server's IP address.
09:02So, what is the DNS?
09:04What is the DNS?
09:05Isp,
09:06the Internet Service Provider,
09:07the IP address is returned.
09:08Then,
09:09the client also has the same IP address.
09:11Then, what is the client?
09:12The request of the IP address.
09:15And who is the IP address?
09:16It can be the Google server's IP address,
09:18or Amazon server's IP address.
09:20So, in this way,
09:22our client,
09:23then,
09:24directly,
09:25can communicate with our server,
09:26or talk about it.
09:28So,
09:29a client,
09:30when a server's IP address,
09:31first,
09:32the server's IP address,
09:33first,
09:34he'll ask the Internet Service Provider,
09:36and he'll ask the ISP,
09:38he'll ask the DNS,
09:39and he'll ask the DNS,
09:40he'll ask the DNS,
09:41he'll ask the DNS,
09:42he'll tell the ISP,
09:43the ISP client,
09:44and then the client,
09:45he'll go directly to the server's IP address.
09:47So,
09:48our website,
09:49which we go to Google,
09:50and search,
09:51we don't talk directly from it,
09:52first,
09:53we'll ask the IP address,
09:55and then,
09:56we'll talk with the IP address.
09:57So,
09:58if I give you an example,
09:59there's a website called nslookup.io,
10:01and if I want to,
10:02let's suppose,
10:03I search for Amazon.in,
10:04I've searched for Amazon.in,
10:05I've searched for Amazon.in,
10:06I've searched for Amazon.in,
10:07what will happen?
10:08This is the IP address,
10:09which I'm showing here.
10:10I'm showing here.
10:11If I want to,
10:12I can search for Google's IP address.
10:13Like,
10:14I've searched for Google.com.
10:15So,
10:16the IP address will be shown here.
10:18So,
10:19the IP address will be shown here.
10:21And,
10:22if I want to copy it,
10:23if I normally paste it in my browser,
10:25then,
10:26what will happen with this IP address?
10:27I'll open my Google search directly.
10:29So,
10:30the IP address will not happen.
10:31It's a website,
10:32it's an address.
10:33Maybe you type the name,
10:34or you type the IP address.
10:36But,
10:37usually,
10:38we type the name,
10:39because we don't remember all IP addresses,
10:41because there are many IP addresses.
10:43So,
10:44I hope that,
10:45about the internet,
10:46there are some basic things,
10:47which I know.
10:48From this,
10:49we must remember that,
10:50every computer has a unique IP address.
10:52And,
10:53if we talk about the internet,
10:55there are many interconnected computers.
10:58in which one can be a client computer,
11:01or one can be a server computer.
11:03And,
11:04there is interaction between these two,
11:06which we can see websites.
11:09So,
11:10the Internet,
11:11the Internet,
11:12and then we can see that,
11:13through the internet,
11:14we could see the details.
11:15We can see the details between the IP address,
11:17and we can see that.
11:18In the out.
11:19And,
11:20the Internet is in the Internet.
11:21We can see the details,
11:22and that the Internet is a private issue!
11:23And,
11:24we can see the details.