Web parts are page components that provide a combination of content and functionality. They are the basic building blocks of portal engine page templates — you can use web parts to create pages directly in your browser through the Pages -> Edit -> Design interface.
Web parts exist on three different levels:
Code files | On the most basic level, web parts are user controls (opens in a new tab) (.ascx files) that inherit from an appropriate base class. |
System objects | Web parts must be registered as objects in the system. The purpose of the objects is to:
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Page components | Web parts placed onto page templates are called web part instances. You can create any number of instances of a single web part. Instances must be inserted into web part zones, which are defined within the layouts of page templates. |
Kentico contains a large selection of web parts by default. You can develop your own web parts or modify existing ones.