What is class library in vb.net

A class library is a project template designed to mainly hold a collection of classes and be compiled to a DLL.

Public class class1 end class ------------------------- class library is used to create the functions that you need to use so many time ...... And after that you can make .dll file of that class so that code can be secured .. And after making .dll you just imports dll name & than use the functions that you had made...... E.g. When user clicks on add button you need to clear every thing on the form so you made this kind of function and call it any where ...... Is it clear ??????