Stack Exchange network consists of 178 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
Q&A for work
Connect and share knowledge within a single location that is structured and easy to search.
Very often I find TL;DR in a post. It's usually in bold or like a title.
What does it mean? Where should it be used?
"too long; didn't read"
People use it to introduce a summary section of their post, for those who can't be bothered with quite so many words.