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What is Visualforce

Visualforce is the component-based user interface framework for the platform. The framework includes a tag-based markup language, similar to HTML. visualforce provides richset of component and also provide way for developers to create their own components. Visualforce uses model-view-controller (MVC) paradigm. and also use auto-generated controllers for database objects, providing simple and tight integration with the database. Developer can write there own controllers, or extensions to controllers, using Apex Code.

How to create Visualforce page

Visualforce page is tag-based markup language page that is use group of markup tag for creating web page.
For creating visualforce page you have to register with and after registration login with username and password like below pic.

login page

After login go to the Build section and expend develop link and click on visualforce page link.(you can findout Build-> develop-> visualforce page link in left side menu of salesforce page)
Build-> develop-> visualforce page.

open visualforce page

Now Click on new Button for creating new visualforce page.

create new page

Now enter Label,Name and Description of visualforce page and click on save button(you can write code in Visualforce Markup section).

new page details

your new visualforce page is created and you can see your visual page by clicking preview button.

new page created

How Visualforce page works and security

this digram is showing how visualforce page work(intract with classes and database) and related security like page lavel security , object lavel security and field lavel security.

visualforce page flow