The Internet holds a wealth of resources for the practicing behavior therapist, and these resources are more easily obtained than might be expected. This article describes the basic processes of the Internet, including equipment and software needed to become a user and contributor, and specific functions offered by the Internet. The use of electronic mail, the World Wide Web, newsgroups and listservs, and talking in real time over the Internet are described as examples. Finally, the interactive contributions that the behavior therapist can make and receive from the Internet are considered.