Strain refers to the deformation or change in shape of a material when a force is applied to it. It is essentially the measure of how much a material stretches or compresses under stress. For example, when you pull on a rubber band, it stretches, and this stretching is a strain.
There are different types of strain, such as normal strain (stretching or compression in a direction) and shear strain (twisting or sliding of layers of the material). Strain is often expressed as a ratio of the change in length or shape to the original dimensions of the material.
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