.NET 9 is the latest major release of the .NET platform, bringing many new features and improvements for developers. In this presentation, you will learn how to use .NET 9 to create full stack applications with Blazor, build resilient cloud-native applications with .NET Aspire, integrate large language models such as OpenAI into your applications with AI with Microsoft Extensions for AI, and use the new features of C# 13. You will also see how to use the latest updates in ASP.NET Core, .NET MAUI, and other components of the .NET ecosystem. By the end of this presentation, you will have a better understanding of how to use .NET 9 to build modern, scalable, and intelligent applications.