Windows 7 is an operating system developed by Microsoft, released in October 2009. It was designed to improve user experience with a more intuitive interface, faster performance, and enhanced security features compared to its predecessor, Windows Vista. One of the key features of Windows 7 is the taskbar, which allows users to pin applications for easy access. It also introduced features like Aero Snap for window management and improved support for touch screens. Windows 7 became popular for its stability and compatibility with a wide range of software and hardware.