A bookmark is used to keep one's place in a printed work. It can also refer to:
Internet bookmark, a pointer (primarily to a web URL) in an Internet Web browser
a marker of one's place in an electronic document
Bookmark Biosphere Reserve, South
Bookmarks (magazine), literary and book review magazine
Bookmarking, method of genetic communication
Social bookmarking, a method for internet users to store, organize, and share links to web pages.