Notepad++ is a free, open-source text and source code editor for Windows that supports over 80 programming languages with syntax highlighting and code folding. Beyond basic text editing, Notepad++ provides powerful features like multi-cursor editing, regex-based search/replace, macro recording, plugin extensibility, and split-screen comparison — making it a versatile tool for developers, system administrators, and data analysts. The key to mastering Notepad++ is understanding its keyboard-driven workflows: most actions can be performed without touching the mouse, and features like column mode, bookmarks, and document maps dramatically improve navigation through large files.