Most of them include security updates. Security issues are the worst possible problem – as they may be exploited by malware or hackers. Other updates address other bugs and issues in Windows. Even though they are not responsible for security vulnerabilities, they might impact the stability of your Operating System, or just be annoying.
Last, but not least, Windows Updates sometimes come with new features, while patching some known issues.
Most computers have Windows Updates set up to “Install Updates Automatically”, which is the recommended setting. However, it is best to manually update security updates whenever possible. I have often found the case where the "automatic updating" simply failed the user. This can occur when certain malware will "prevent" such "automatic updating" in order to stay alive in your PC.
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