Paint.NET is free, lightweight, and fast image/photo editing software for Windows, serving as a more powerful, feature-rich alternative to MS Paint. It supports layers, unlimited undo, special effects, and a variety of tools, making it popular for editing and graphic design. Developed by dotPDN LLC and originally created as a student project, it is highly regarded for its intuitive interface.

This video provides a beginner's guide to the basics of Paint. NET: