What is the difference between a custom control and a user control ?

Sno	User Control	Custom Control
1	Is a file with the .ascx extension	Is a file with the .dll extension
2	Can be only used with the application	Can be used in any number of applications
3	Language dependent.	They are language independent, a control created in c# can be used in vb.net
4	Can’t be added to Visual studio Toolbox	Can be added to Visual studio Toolbox
5	Inherits from Server controls and easy to create.	You have to develop from scratch , so comparatively difficult.
6	Generally used for static content	Used when dynamic content is required