While looking at What abilities are moderators given? I noticed that the question has been merged:

What is the difference between a merged question, and one that has been closed as a duplicate?
While looking at What abilities are moderators given? I noticed that the question has been merged:

What is the difference between a merged question, and one that has been closed as a duplicate?
If you look at the text of a Closed as Duplicate post (example) it says:
This question covers exactly the same ground as earlier questions on this topic; its answers may be merged with another identical question. See the FAQ.
When questions are merged the answers from both questions are placed into the original question. This will be handy when someone provides a good answer to a duplicate question. After a merge there will only be one question with all the answers, thus making it easier to search and get answers. Also, the answers won't be part of a closed question any more.