), a service offered by Microsoft, provides updates for Windows components.It can be replaced with Microsoft Update, an expanded version of the service which provides for other Microsoft software as well, such as Microsoft Office, Windows Live Essentials and Microsoft Expression Studio.

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For previous versions of Microsoft Windows, users can download updates from the Windows Update website, using Internet Explorer.

Windows Update was introduced as an Internet web site with the launch of Windows 95.

A link to Windows Update on the Start Menu gave access to additional downloads for the operating system.

At the time of Windows 98's release, Windows Update offered additional desktop themes, games, device driver updates, and optional components such as Net Meeting.

Microsoft routinely releases security updates on the second Tuesday of each month (Patch Tuesday), but can provide them whenever a new update is urgently required to prevent a newly discovered or prevalent exploit targeting Windows users.

System administrators can configure Windows Update to install critical updates automatically so long as the computer has an Internet mobile connection, without the user needing to install them manually, or even be aware that an update is required.

Windows Vista and later provide a Control Panel to configure update settings and check for updates.

The Windows Update Control Panel also has the function of downloading Windows Ultimate Extras, optional software for Windows Vista Ultimate Edition.

Windows 95 and Windows NT 4 were retroactively given the ability to access the Windows Update website, and download updates designed for those operating systems, starting with the release of versions of Internet Explorer 4 for those operating systems.