What is boot loop?

[AC Question]

I've had a stoke, what does it mean?

 

[Jason Cockerham]

A boot loop is when you try to turn on or restart your phone and the phone will never fully start up and simply keeps restarting itself over and over again. It's very annoying and unfortunate but there are ways to fix it. Are you experiencing one on your device?

 

[Laura Knotek]

If indeed you are experiencing a boot loop, what device do you have and what version of Android is it running?