Use the sealed keyword in C# to prevent a class from being inherited. This ensures that the class's implementation cannot be altered by any derived classes, which can be useful when you want to lock down the behavior of a class.

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> 🔍 Why use it?

- Security:
Prevents unwanted changes by other developers.

- Optimization:
The JIT compiler can optimize calls to methods in a sealed class since it knows the method won't be overridden.