Mohr's Law describes the relationship between stress and strain in materials, particularly in the context of mechanical engineering and materials science. It states that the maximum shear stress in a material is proportional to the difference between the maximum and minimum normal stresses acting on it. This principle helps engineers predict how materials will behave under various loading conditions. The law is often represented graphically using a Mohr's Circle, which visually illustrates the state of stress at a point in a material. By analyzing this circle, engineers can determine critical points of failure and ensure that structures are designed to withstand applied forces safely.