.NET Architecture is built upon core components that enable application development. The Common Language Runtime (CLR) manages code execution, providing memory management and security. The Base Class Library (BCL) offers reusable classes and functions. The .NET SDK includes compilers and development tools for multiple programming languages. The architecture also integrates ASP.NET for web applications, Entity Framework for database management, and Xamarin for mobile development. With the addition of .NET MAUI for multi-platform applications and Blazor for web UI, .NET remains a robust ecosystem for building scalable and maintainable software solutions.