Why is my laptop or desktop showing a blue screen error? What's the Blue Screen of Death error and how to troubleshoot it

Blue Screen of Death Error: Thousands of Windows users are facing the Blue Screen of Death (BSOD) error due to a recent CrowdStrike update, affecting companies, banks, and government offices in the US and Australia. The BSOD causes sudden system shutdowns or restarts. Users are advised to remove recent hardware, update Windows, or use the Blue Screen Troubleshooter. Microsoft is working to resolve the issue.