.NET in 100 seconds

.NET is a free, open-source platform for building high-performance software across web, mobile, enterprise, and gaming domains. Originally Windows-centric, it evolved through .NET Core (2016) to modern .NET (2020) with cross-platform support. The platform uses the Common Language Runtime for memory management and supports multiple languages (C#, F#, Visual Basic) that compile to Common Intermediate Language. Its ecosystem includes ASP.NET, Blazor, Entity Framework Core, MAUI, and integrates with frameworks like Unity and AutoCAD. A simple console app example demonstrates basic C# syntax for user input validation.