Web sites can define an image to be their icon, or the iPad will create one by taking a small picture of a portion of the page you bookmark.
Open the page you want to bookmark in Safari and tap the “+” icon immediately to the left of the address bar. You’ll see the following menu appear:
Tap “Add to Home Screen” and the bookmark will appear on your iPad’s desktop. This is an especially great way to bookmark web applications, which are often equally and sometimes even more useful than the apps available in the Application Store.