The sealed class

One of the principles of OOP is inheritance, but sometimes you may need to restrict inheritance in your code for the sake of your application's architecture. C# provides a keyword called sealed. If this keyword is placed before a class's signature, the class is considered a sealed class. If a class is sealed, that particular class can't be inherited by other classes. If any class tries to inherit a sealed class, the compiler will throw an error. Structs can also be sealed, and in that case, no class can inherit that struct.

Let's look at an example of a sealed class:

sealed class Animal {
    public string name;
    public int ageInMonths;
    public void Move(){
        Console.WriteLine("Moving");
    }
    public void Eat(){
        Console.WriteLine("Eating");
    }
}
public static void Main(){
    Animal dog = new Animal();
  ...