Encapsulation and Data Abstraction are two fundamental Object-Oriented Programming (OOP) concepts and are very commonly asked in interviews. Let's understand them clearly with simple definitions, differences, and real-world examples.

LINQ (Language INtegrated Query) is a feature in C# that allows you to query collections, databases, XML, APIs, etc. using SQL-like syntax directly inside code.

async and await are used in C# to write asynchronous, non-blocking code in a simple and readable way. They are heavily used in .NET applications like Web APIs, UI apps, and file/network operations.

The Factory Design Pattern is one of the most commonly asked Design Pattern interview questions.
Let’s understand it in a simple, interview-friendly way with real-world examples and C# code. The Factory Design Pattern is used to create objects without exposing the object creation logic to the client.

Instead of using new everywhere, you delegate object creation to a factory class.

SOLID Principles are 5 Object-Oriented Design principles that help you write clean, maintainable, scalable, and testable code. These are very commonly asked in C# interviews.

Generics in C# are one of the most frequently asked interview topics.  Generics allow you to define classes, methods, interfaces, and delegates with a placeholder type. Instead of writing separate code for each type (int, string, etc.), you write code once and reuse it for multiple types.

Delegates are one of the most commonly asked C# interview topics. A Delegate is a type-safe function pointer.

Dependency Injection (DI) is one of the most commonly asked .NET Core interview questions. Dependency Injection (DI) is a design pattern where an object receives its dependencies from outside instead of creating them itself.