Windows is the dominant operating system globally, developed by Microsoft, and serves over a billion users. The latest version is Windows 11, which debuted in October 2021, featuring significant visual and functional enhancements. Microsoft began rolling out the 24H2 update in mid-2024, introducing AI hardware support, enhanced security, and new features like Copilot and Recall. The upcoming 25H2 update is expected in late 2025, utilizing a lightweight enablement package for a swift upgrade process. Development on Windows 12, codenamed Hudson Valley, is ongoing, with a potential release in late 2026 or early 2027, focusing on AI-first computing and modular architecture. Users can check their current Windows version by pressing the Windows key + R and typing winver. Upgrading from Windows 10 to Windows 11 is free for eligible systems, while Windows 11 Home costs 9 and Windows 11 Pro costs 9. The end-of-support date for Windows 10 is October 14, 2025, making an upgrade advisable for continued security and access to new features.