What does TL;DR stand for?
"TL;DR" stands for "too long; didn't read" and is often used as a tongue-in-cheek way to provide a summary of a longer piece of content up front.
The term likely originated on social media and is now widely used across the web. Next time you come across TL;DR think about it this way: If you don't want to take the time to read, someone has already gone through the trouble of summarizing things. How nice is that?