Entity Framework (EF) is an open-source Object-Relational Mapping (ORM) framework for .NET developers. It simplifies the process of working with databases by allowing developers to interact with data using high-level programming constructs rather than writing raw SQL queries.

Key Features:
Model-First, Code-First, and Database-First Approaches: Provides flexibility in designing the database schema and application models.
LINQ (Language-Integrated Query): Enables querying the database using C# or VB.NET syntax.
Lazy and Eager Loading: Optimizes data retrieval by loading related entities either on-demand or upfront.
Migration Tools: Facilitates database schema updates as the application evolves.
How It Works:
Mapping: Maps database tables to .NET classes, columns to properties, and relationships to navigation properties.
Context Class: Acts as a bridge between the database and the application, managing data retrieval, updates, and transactions.
Change Tracking: Automatically tracks modifications to objects and applies those changes to the database.
Benefits:
Productivity: Speeds up development by abstracting database complexities.
Maintainability: Makes code more readable and easier to manage.
Integration: Works seamlessly with other .NET tools and frameworks.
Cross-Platform: Supports multiple database systems, including SQL Server, MySQL, PostgreSQL, and SQLite.
Entity Framework is a powerful tool for building data-driven applications, enabling developers to focus on business logic rather than database management.