The Microsoft Developer Network (MSDN) is a platform created by Microsoft to provide developers with resources, tools, and documentation for building applications on Microsoft technologies. It offers a wide range of materials, including code samples, tutorials, and forums, to help developers learn and troubleshoot. MSDN also includes access to software development kits (SDKs) and APIs, enabling developers to integrate their applications with various Microsoft products and services. By fostering a community of developers, MSDN aims to enhance collaboration and innovation within the Microsoft ecosystem.