This site contains the set of CiviCRM books developed and maintained by CiviCRM community.

User and Administrator Guide

The official book on CiviCRM. A guide to the set up and every day use of CiviCRM, including planning, configuration, everyday use, reporting and more.

Documentation Wiki

Contains reference material and guides supplemental to the book.

Developer Documentation

Everything you need to know for customizing, extending and debugging CiviCRM.
Note: has been moved from book to wiki format to better keep pace with new developments