Overloading and overriding are two concepts of OOP (Object Oriented Programming) that are used to increase the code readability, reusability, and maintainability. They allow a programmer to achieve the same functionality with different signatures such as number, type, and order of parameters. While both of these concepts can be used to achieve the same goal, they are quite different.

Overloading is a feature of C# that allows multiple methods to have the same name but different parameters. This is useful because it allows the programmer to use the same method name for different purposes. For example, a programmer can create two methods with the same name, one that takes two and three parameters. The two-parameter method might do something different than the three-parameter method. This allows the programmer to reuse code and make the code more readable.

In contrast, overriding is a feature of C# that allows a derived class to replace the functionality of a base class. Overriding is used to change the behavior of a method in the derived class. This can be used to customize the behavior of an inherited method so that it is suitable for the derived class. For example, a derived class might have a different implementation of a method inherited from the base class. The derived class can then override the base class method to provide its implementation.

Overall, overloading and overriding are two concepts in C# used to achieve the same goal: improving code readability, reusability, and maintainability. Overloading allows multiple methods to have the same name but different parameters while overriding allows a derived class to replace the functionality of a base class. Both of these concepts can be used to improve the code, but they have different uses and should be used in the appropriate situations.