LISP, which stands for LISt Processing, was developed in the late 1950s by John McCarthy as a language for manipulating symbols. This book presents the Common LISP programming language, which is a version of LISP, and details it range of applications, including data structures, computer systems, and compiler design. It presents a tutorial introduction; explains lists and trees, recursion, local vs. global reference, characters and strings, streams, LAMDA and LABELS, control, debugging, macros, structures, classes and objects, vectors and arrays, and efficiency and compilation.