The Windows Update utility determines which updates are applicable to your computer and then downloads and installs them automatically.
To ensure that your computer stays up to date, you should select the option to automatically install both the Important and the Recommended updates.
If an update requires a restart to complete the installation process, you can schedule this action for a specific time when it will not disrupt your work. You can also postpone a previously scheduled restart until your current work is complete.
If a software update applies to a file in use, Windows can save the application's data, close the application, update the file, and then restart the application.
To manage the update process, Windows Update provides options that give you control over how you are notified about updates, as well as the ability to review and approve updates before they are downloaded or installed.
At any time, you can also manually check for, and install any available updates using the Windows Update control panel. You can scan for updates, review details about each one, access your update history, and manage your update preferences.