Windows XP is a row of OS created by Microsoft for apply on PC, containing home and business desktops, laptops, and media centers. It was released in 2001. The name "XP" is stands for "eXPerience".

XP is descendant to together Windows 2000 Professional and Windows Me, and is primary customer oriented OS generated by Microsoft build on Windows NT kernel and design. XP was out in 2001, and over 400 million copies were in use in few years. It was do well by Vista, which was out for customers in 2006 and global to general public in 2007. Direct OEM and retail sales of XP stopped in 2008. Microsoft keeps on selling XP through their System Builders program until 2009. XP may keep on being available as these sources run through their inventory or by buying Windows Vista Ultimate or Business and then downgrading to Windows XP.

Ordinary versions of OS are XP Home Edition for home users, and XP Professional gives extra features like support for Windows Server domains and two physical processors for power users, business and enterprise clients. Windows XP Media Center Edition has extra multimedia features improving ability to record and watch TV shows, view DVD movies, and listen to music. Windows XP Tablet PC Edition is intended to run applications built using Tablet PC platform. XP 64-bit Edition for IA-64 (Itanium) processors and XP Professional x64 Edition for x86-64 these are extra designs for XP. Also Windows XP Embedded, a component edition of XP Professional, and versions for particular markets like Windows XP Starter Edition. By mid 2009, a company exposed first Windows XP powered cellular telephone.

The NT based editions of Windows are known for their enhanced stability and competence over 9x versions of Microsoft Windows. Windows XP offers a notably redesigned GUI, a alter Microsoft promoted as more user-friendly than earlier editions. A new software management tool known as Side-by-Side Assembly was introduced to ameliorate "DLL hell" that plagues 9x editions of Windows. This is primary version of Windows to utilize product activation to battle illegal copying, a limit that did not sit well with some users and privacy advocates. Windows XP has also been criticized by some users for security vulnerabilities, tight integration of applications like Internet Explorer 6 and Windows Media Player, and for features of its default user interface.