What is the ‘blue screen of death’? The global tech outage explained

A global tech failure disrupted operations across multiple industries on Friday, halting flights and forcing a number of broadcasters off-air, as the outage upended everything from banking to healthcare systems.

What happened?

CrowdStrike, a US cybersecurity company, is among the most popular in the world, counting more than 20,000 subscription customers around the world.

According to an alert sent by CrowdStrike to its clients, its widely-used “Falcon Sensor” software is...