*Repository:* where CVS keeps files that contain the contents and metadata of the files you're managing *Working Copy:* an editable version of a set of files managed by CVS *Trunk:* The default set of revisions to the files CVS manages. *Branch:* An alternate set of revisions to files. There can be many branches. *Merge:* To incorporate a set of revisions into a file or group of files. The revisions can come from the trunk or a branch. *Tag:* A symbolic name given to the state of a file at a particular time in its history. You can apply the same tag to many files at once.