+**Deformation** is the alteration of a body's [Shape](/wiki/shape) or [Size](/wiki/size) when subjected to an external force. This change can be temporary or permanent, reflecting the material's internal response to applied [Stress](/wiki/stress).
+## See also
+- [Strain](/wiki/strain)
+- [Elasticity](/wiki/elasticity)
+- [Plasticity](/wiki/plasticity)
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