This document provides an overview of stress and strain presented by Mr. Rahul R. Kundiya. It defines stress as the ratio of applied force to resisting area, and describes the two main types of stress: normal stress which acts perpendicular to the resisting area, and combined stress such as shear and torsional stress. It also defines strain as the ratio of change in dimension to original dimension, and describes the different types of strain including tensile, compressive, volumetric, and shear strain. Finally, it introduces Hooke's Law which states that within the elastic limit, stress is directly proportional to strain, with the constant of proportionality being the modulus of elasticity.