Glossary
Patch
Software update that closes a vulnerability or fixes a bug – the single most important routine protection.
A patch is a software update that closes a vulnerability or fixes a bug. Microsoft ships patches on the second Tuesday of each month ("Patch Tuesday"); Apple, Google, and browser vendors also push regular updates.
Missing patches remain in 2026 the single most common cause of successful attacks – ahead of phishing.
Why this matters in 2026
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How to protect yourself
A current operating system, an up-to-date antivirus suite, strong unique passwords (use a password manager) and two-factor authentication on all important accounts already cover the vast majority of real-world risk. Detailed guides: see our How-To section.