The potential uses of the Internet to behavioural and cognitive psychotherapists and researchers are manifold. This article summarizes what the Internet is, how to connect to it, searching the Web, on-line publishing, discussion forums, chat-rooms, literature searching, transfer of documents and creating a web-site. It considers the potential of Internet technology in therapy and enhancing patient/therapist contact. A web page containing links to many of the sites referred to in this article as well as additional links and resources is accessible through the BABCP website (www.babcp.org.uk).