WebPart:ASP.NET Web Parts controls are an integrated set of 
controls for creating Web sites that enable end users to 
modify the content, appearance, and behavior of Web pages 
directly in a browser. The topics in this section provide 
information on what Web Parts are, how they work, and how 
to use them to create user-customizable ASP.NET Web pages.

---Personalize page content. Users can add new Web Parts 
controls to a page, remove them, hide them, or minimize 
them like ordinary windows.

---Personalize page layout. Users can drag a Web Parts 
control to a different zone on a page, or change its 
appearance, properties, and behavior.

There Are Three Zone
1)WebPart Zone
2)Catalog Zone
3)Editor Zone