Installing updates: why and how

In short: Updates close security holes and fix bugs. Install them promptly, ideally automatically.

In more detail: Software has bugs. Once a security hole becomes known, attackers exploit it quickly. Makers deliver updates that close these holes. If you do not update, you stay vulnerable.

In Depth

• Windows: Settings → Windows Update → “Check for updates”. Leave automatic updates on.
• Restart: Some updates only finish after a restart.
• Programs: Keep browser, PDF reader, Office and co. up to date too.
• Phone: Settings → software update. Update apps in the store.
• Router: It also needs updates occasionally.
• If an update takes very long: Do not switch off! Be patient, keep power connected.
• Old systems: Systems without support (for example Windows 7) get no more security updates.

See also: Antivirus and firewall for beginners, Turning a computer on and off