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A link is a connection from one Web resource to another. A link has two ends -- called anchors, and a direction. The link goes from the tail to the head. The head and tail are also known as destination and source, respectively. In the Web, nodes are connected by links.

Although a simple concept, the link has been one of the primary forces driving the success of the Web.  The link starts at the "source" anchor and points to the "target" anchor, which may be any Web resource (e.g., an image, a video clip, a sound bite, a program, an HTML document, an element within an HTML document, etc.). The text between the opening and closing tags, <A attributes> ...text... </A> can be the source or target (or both) of a link.