How did one CrowdStrike mistake stop the world?

Editor's note: Check out our oft-updated live blog for all new developments about the Microsoft/CrowdStrike outage.

Updating your system is imperative to keeping it safe from cyber attacks and other threats. But sometimes it goes wrong — like it did late this week.

CrowdStrike, a cybersecurity company that protects companies and users from cyberattacks, made a mistake, leading to a global meltdown. Users with Windows computers saw the "blue screen of death", flights were grounded, banks went dark, and websites shut down.