Description: The term ‘rigid’ refers to materials that exhibit high resistance to deformation under applied forces. This means that when a force is applied, these materials do not bend or deform easily, maintaining their original shape. Rigidity is a fundamental physical property related to the elasticity and strength of a material. In engineering and design terms, rigidity is crucial for ensuring the stability and durability of structures and components. Rigid materials often have high density and an internal structure that allows them to withstand significant loads without undergoing permanent changes. This property is especially valued in applications where precision and structural integrity are essential, such as in the construction of buildings, bridges, and machinery. Rigidity is also evaluated in the context of material dynamics, where the response of materials to different types of forces and environmental conditions is studied. In summary, rigidity is a key characteristic that determines the behavior of materials in various applications, being fundamental to engineering and architecture.