A sealed class can not be inherited.

• It cannot be used as a base class.
• It prevents derivation.
• It is created by using the sealed keyword.
• To access the sealed members, the sealed class must be instantiated.

Example

public sealed class MySealedClass
{
   
}

Note:

Using the keyword sealed, we can stop the derived class from overriding a virtual class method.

Example

public class MyDerivedClass : MyBaseClass
{
   public sealed override void MyMethod() // Classes that inherit from MyDerivedClass can't override MyMethod
   { 
   }
}