Bookmarks mark a particular location in a file. The Bookmark command allows you to set, jump to, and remove marks from the mark list. Each mark has a name, and specifies a file and line number. The Bookmark command also displays the function or symbol where the mark is located
Bookmarks are useful for keeping track of particular locations of interest in your files. The marks you have set are saved in the current workspace, so they will be preserved from session to session.
Bookmarks are maintained as you edit your files. For example, if you set a mark on a particular line, and then insert lines before that one, the mark will still be on the original line of text, even though the actual line number may have changed. If the line that the mark is set at is deleted or the file is closed, then the mark is deleted also.