Updates
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... rectify errors.
... close security gaps and thus reduce potential attacks.
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Keep all applications, the operating system, and the antivirus program updated.
The easiest way for most systems and programs is to: Go to Settings > Updates > Turn on automatic updates.
Install updates regularly and as soon as possible when they are available.
Software that no longer receives updates or support may be a security risk and should be uninstalled.
Security Updates | BSI
Operating systems for PCs and laptops, media players for audio and video files, software for mobile phones, and even virus protection programs only offer secure protection against computer malware if they are up to date.
Source: BSI