The Kelvin-Voigt model represents viscoelastic materials that exhibit both elastic and viscous behavior. It consists of a spring (representing elasticity) and a dashpot (representing viscosity) connected in parallel. The material’s response under stress involves an instantaneous elastic deformation, followed by a gradual viscous deformation. The Kelvin-Voigt model is commonly used to describe materials like polymers and soft tissues, where both elastic and viscous effects are present.