Depending on your web browser, a links toolbar can also be called a "bookmarks toolbar" or a "favorites bar".

Favorites Bar in Internet Explorer

Bookmarks Toolbar in FireFox

The purpose of a links toolbar is to provide fast access to your top favorite web links.

In Firefox and some other browsers, you can drag links from a web page directly onto your Bookmarks Toolbar.

In Internet Explorer you can select the Favorites Bar folder when you save a favorite link.

The links toolbar is also a place where you can store bookmarklets (also called favlets or browser buttons).