Object-oriented programming (OOP) is a programming paradigm based on objects and classes. The .NET Framework supports multiple OOP languages like C#, Visual Basic.NET, and C++. These languages allow developers to create classes with properties, methods, events, and other components, leveraging OOP principles like encapsulation, inheritance, and polymorphism. The .NET Framework provides built-in support for key OOP concepts, enabling developers to create modular, reusable, and maintainable code for robust and scalable applications.

A delegate in .NET is a type that holds a reference to a method with a specific signature. It acts as a type-safe function pointer, allowing methods to be passed as arguments or stored in variables. Delegates enable event-driven programming and dynamic method invocation without knowing the exact method at compile-time. They provide a mechanism for defining callback methods, enhancing code flexibility and reusability in .NET applications.

A class is a blueprint or template that defines the properties and methods that an object will have. It serves as a logical construct that specifies the characteristics and behavior of objects. On the other hand, an object is a specific instance of a class, created from the class blueprint. It represents a concrete entity that has its own unique set of data (property values) and can perform actions (methods) defined by the class. While a class is just a definition, an object is a tangible entity that can be created and manipulated in the program.

An interface serves as a blueprint for implementing classes, defining the contract or behavior they should adhere to. It exclusively declares properties, methods, and events without access modifiers, all of which must be implemented. On the other hand, an abstract class offers a partial implementation of functionality along with abstract/virtual members that inheriting entities must implement. Additionally, it has the capability to declare fields. It's important to note that neither interfaces nor abstract classes can be instantiated.

Storage classes in C++ define two key aspects of variables and functions:

• Visibility: The scope or accessibility of a variable/function within the program.
• Lifetime: The duration for which a variable/function exists and remains active in memory.

These classes allow programmers to control the behavior, scope, and memory management of variables and functions in their C++ code.

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