What does this site mean when the questions are "locked"?

I was just looking at a question that I thought I might answer but it said, This question is locked? How does a question get...

What does it mean when a question is locked? And why?

When a question is locked that means is bad sorry I just changed the tittle of the question because I thought it was a better...

why did my question get locked and how ? and what does it mean?

what does locked for review mean?? I saw it on one of the questions...

Two questions; What does it mean when a question is locked? I noticed the anorexic questions were locked. AND, why do some qu...

on funadvice? Just because it says it on the last question I asked :)

How come my questions dont show up on the screen on this site?

I was just wondering why you can't tab when asking or answering question on this site. It's not a HUGE deal but i'm a little ...

why are a lot of the questions locked now? you cant give advice if the question is locked.