Fragment identifiers
A URL can include a fragment identifier that is interpreted by the client once a requested resource has been received. A fragment identifier is included at the end of a URL separated from the path by the # character. The meaning of the fragment identifier depends on the type of the resource. For example, the following URL includes the fragment identifier tannin for a HTML document:
http://example.com/documents/glossary.html#tannin
When a web browser receives the HTML resource, it then positions the rendered document in the display to start at the anchor element <a name="tannin"> if the named anchor exists.