Automatic update is the browser’s built-in system for downloading and applying security fixes with little or no user action. In Chrome and similar browsers, it helps move devices from a vulnerable build to a patched build as quickly as possible, often before attackers can reliably exploit a known flaw.
This matters because browsers are a common entry point for malicious links, ads, scripts, and documents. Even strong defenses such as sandboxing and site isolation still depend on timely patching. In real attacks, threat actors often race the update cycle: if a user or organization delays restarts or disables auto-update, the old vulnerability remains usable. For defenders, enabling automatic update, verifying that it is functioning, and forcing restarts on managed devices are basic but critical ways to shrink the exposure window.