link
Synonyms: hyperlink
A reference to another document which can be activated by the user to view that document.
For example, the body text of an e-book might contain a link to an endnote or appendix.
Links can also be used to include information or instructions from another document in the current document.
For example, an e-book chapter can use a link to specify which stylesheet should be used to visually lay out the contents of that chapter.