Bsod (Or known as blue screen of death) Is an error that shows up when you're computer has run into a fatal error. Its nearly impossible or just very difficult to intentionally get you're self. Now and days, on a windows machine thats updated, only has a blue screen with a sad face saying you're computer has run into a problem and needs to restart. Not nearly as 'Scary' or 'Frightening' as the original.
BSOD is short for Blue Screen Of Death, also called a STOP Error, will appear when an issue is so serious that Windows must stop completely.
A Blue Screen of Death is usually hardware or driver related. Most BSODs show a STOP code that can be used to help figure out the root cause of the Blue Screen of Death.
Restart PC after the BSOD could solve the problem usually. Some blue screen flashes and your computer reboots automatically before you have time to read anything.