This is a pedagogical introduction to the subjects of quantum information and computation. Topics include non-locality of quantum mechanics, quantum computation, quantum cryptography, quantum error correction, and fault-tolerant quantum computation, as well as some experimental aspects of quantum computation and quantum cryptography. Only knowledge of basic quantum mechanics is assumed. Whenever more advanced concepts and techniques are used, they are introduced carefully. This book is designed to be a self-contained overview and is based on a series of lectures held at Hewlett-Packard Laboratories, Basic Research Institute in the Mathematical Sciences (BRIMS), Bristol, from November 1996 to April 1997, but it also includes other contributions.