What is ASP.NET MasterType directive - Directives And how to use

What is ASP.NET MasterType directive - Directives And how to use:

The MasterType Directive:

The MasterType directive assigns a class name to the Master property of a page, to make it strongly typed.

The basic syntax of MasterType directive is:

<%@ MasterType attribute="value"[attribute="value" ...]  %>

Some Others Are 

IMPORT DIRECTIVE

MASTER DIRECTIVE

MASTERTYPE DIRECTIVE

OUTPUTCACHE DIRECTIVE

PAGE DIRECTIVE

PREVIOUSPAGETYPE DIRECTIVE

REFERENCE DIRECTIVE

REGISTER DIRECTIVE