Difference between sealed class and abstract class

[bhagawatshinde]

Hi guys , Is their is any comparision between sealed class and abstract class. When to use sealed and abstract class.

[Momerath]

A sealed class cannot be derived from, you can't inherit from it.
An abstract class must be derived from, you have to inherit from it and create the missing methods.

[pritesh2010]

The abstract keyword enables you to create classes and class members that are incomplete and must be implemented in a derived class.

The sealed keyword enables you to prevent the inheritance of a class or certain class members that were previously marked virtual.

[parth vyas]

if we can create a object of sealed class then it has not need to create a derived class .
but abstract class has no any object so we must create
derived class