CTH is a multi-material, large deformation, strong shock wave, solid mechanics code developed at Sandia National Laboratories. CTH has models for multi-phase, elastic viscoplastic, porous and explosive materials. Three-dimensional rectangular meshes; two-dimensional rectangular and cylindrical meshes; and one-dimensional rectilinear, cylindrical, and spherical meshes are available. It uses second-order accurate numerical methods to reduce dispersion and dissipation and produce accurate, efficient results.