Microsoft Windows is a family of operating systems developed by Microsoft. It is best known as the main desktop operating system for IBM-compatible personal computers and later x86, x64 and ARM-based devices.
Windows began as a graphical environment for MS-DOS and later became a full operating-system family. Modern desktop versions are based on the Windows NT line, which also underpins Windows Server.
Development
Microsoft announced Windows in the 1980s as a graphical interface for personal computers. Early versions such as Windows 1.0 and Windows 2.0 were limited compared with later systems, but they introduced the basic idea of graphical applications, windows, menus and mouse-driven use on Microsoft-compatible PCs.
Windows 3.x made the platform more successful in the early 1990s. Windows 95 then became a major consumer release, introducing the Start menu, taskbar and stronger support for plug and play hardware. Later consumer releases included Windows 98 and Windows Me.
The Windows NT line was built with a different architecture aimed at stability, security and business use. Windows XP brought the consumer and NT lines together in a way that became the foundation for later releases.
Major Versions
Important desktop versions include:
- Windows 1.0, released in 1985;
- Windows 3.x, which made Windows more widely used;
- Windows 95, which introduced the Start menu and taskbar;
- Windows XP, a long-lived consumer and business release;
- Windows Vista, which introduced major security and driver-model changes but had a poor reputation at launch;
- Windows 7, a widely used successor to Vista;
- Windows 8 and 8.1, which pushed a touch-focused interface;
- Windows 10, which returned to a more familiar desktop model and used ongoing feature updates;
- Windows 11, the current main client line.
Features
Windows provides the basic software environment for running desktop applications, managing hardware, connecting to networks, storing files and administering users. Common features include the desktop shell, File Explorer, Windows Update, device drivers, networking tools, security controls, accessibility features and system administration utilities.
Business versions add features such as domain join, Group Policy, BitLocker, Hyper-V, remote management and deployment tools. Windows Server is a related but separate product family for server workloads.
Software and Compatibility
Windows became successful partly because of the huge amount of software written for it. That compatibility is useful for users and businesses, but it also creates long-term maintenance problems. Old applications, drivers and workflows can make organisations slow to upgrade even when a version is close to the end of support.
Microsoft maintains compatibility through application programming interfaces, compatibility layers and enterprise deployment tools. Even so, major Windows upgrades can still break old drivers, specialist hardware or unsupported software.
Security and Updates
Modern Windows versions rely on regular security updates, malware protection, account controls, secure boot support, encryption features and enterprise management tools. Windows Update is important because unsupported systems become exposed to newly discovered vulnerabilities.
Microsoft publishes lifecycle information for supported Windows versions. As of 2026, Windows 11 is the main supported client line for new PCs, while Windows 10 reached the end of general support on 14 October 2025, apart from specific extended or long-term servicing arrangements.
Criticism
Windows has been criticised for forced updates, telemetry, pre-installed apps, advertising in parts of the interface, hardware requirements, confusing settings pages and the gradual push towards Microsoft accounts and cloud services. Some users also object to how tightly Windows is connected to Edge, OneDrive, Bing and Microsoft 365.
At the same time, Windows remains important because it supports a large software ecosystem, many games, specialist business tools and a wide range of hardware.
See Also
References
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