What is S controls in salesforce?

Hi Suraj,

S-controls provide a flexible, open means of extending the Salesforce user interface, including the ability to create and display your own custom data forms.

But, Visualforce pages supersede s-controls. Organizations that haven’t previously used s-controls can’t create them. Existing s-controls are unaffected, and can still be edited.

For more knowledge please visit this link.

Hope this helps you.

Thanks

S-Controls allow Salesforce developers to leverage HTML and Javascript to create custom pages and UI components.  These customizations are used when an admin needs to work with a small set of records or fields, or if he or she needs to link to an external server.

S-Controls enable developers to add their own functionality to a Salesforce org.  Among some of the possibilities, you can integrate hosted apps, or extend the Salesforce UI.

Visualforce: Visualforce is the new force.com technology that lets you create custom user interfaces for your Force.com applications. With Visualforce, you can reuse many of the components found in existing Salesforce interfaces or create your own. Moreover, the interfaces can also tap into custom business logic.