Howe presents a straightforward and intuitive approach to examine each type of interface (solid-vapor, solid-liquid, solid-solid) using a simple nearest-neighbor broken-bond model and to compare these results with those from more sophisticated many-body atomistic calculations. The atomistic treatments are then compared with thermodynamic and kinetic descriptions of the interfaces which are continuum treatments. The book mainly deals with metal atoms and utilizes the face-centered cubic crystal structure whenever possible. Most of the concepts discussed can be readily applied to other material systems including organics.