Paint.NET is a free image and photo editing software designed for Windows. It offers a user-friendly interface that makes it accessible for beginners while providing advanced features for more experienced users. With tools for layers, special effects, and a variety of editing options, it allows users to create and modify images easily. Originally developed as a college project, Paint.NET has grown into a popular alternative to more complex software like Adobe Photoshop. It supports various file formats and includes a community-driven plugin system, enabling users to enhance its functionality with additional features and tools.