Overview of Visualforce
Visualforce is a combination of a page containing the presentation and Apex classes containing the business logic. The presentation is usually HTML rendered in the Web browser, but Visualforce also supports content types such as XML and PDF. HTML output is typically interactive, building up state by collecting user input across a series of related pages.
Force.com processes Visualforce pages on its servers. Only the final rendered page and partial page updates are returned to the Web browser—never the raw data or business logic. Visualforce is driven by metadata. It can use the definition of fields in the database to provide the appropriate user interface, without custom code. For example, a Visualforce page with an input ...
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