What is a sticky thread?

[Cool Joe]

wat is a sticky thread?

[Pathik]

It's a thread which has been stuck on the top.
Like this: How to Ask a Question Here!
Superglue is used to stick em, So only Mods with some superpowers can remove them.

[Third Eye]

From forum FAQ

'Sticky' threads are created by moderators or administrators (?), and remain 'stuck' to the top of the listing, even if they haven't had any posts recently. Their purpose is to keep important information visible and accessible at all times.

The most important threads in a certain category on a forum or a message board