This second edition offers a comprehensive collection of state-of-the-art chapters on continuum mechanics, covering topics such as the constitutive theory of magnetoelastic solids, solids with evolving reference configurations, second-gradient solids, and biological tissues. Featuring both updated original chapters and new contributions from leading experts, it provides a rigorous theoretical treatment of constitutive laws for modeling the mechanical and coupled-field behavior of solid materials. The book explores a broad spectrum of material behavior, including isotropic and anisotropic nonlinear elasticity, implicit theories, viscoelasticity, plasticity, electro- and magneto-mechanical interactions, growth, damage, thermomechanics, poroelasticity, composites, and homogenization. By presenting a unified theoretical framework, it serves as a valuable resource for researchers studying the deformation of solid materials across various applications and is an essential reference for graduate students, senior academics, and industry professionals alike.