Notepad++ is a free, open-source text and source code editor for Windows. It supports various programming languages, making it a popular choice among developers. The software features syntax highlighting, code folding, and auto-completion, which help users write and edit code more efficiently. In addition to its core functionalities, Notepad++ allows users to customize their experience with plugins and themes. It also supports multiple document interfaces, enabling users to work on several files simultaneously. Overall, Notepad++ is a versatile tool that caters to both novice and experienced programmers.