What is S-Control in salesforce?

Hi,

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

Scontrols get executed in the browser client-side.

Thanks.