I want to know , Is there a future for a closed question. Means what can be done after a question is closed? I know we can comment on closed question but what about other aspects about the question like "answering them", "up-voting or down-voting them" or "accepting answers for it" ?
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Closed questions follow three general paths:
When a question is deleted, all of the rep earned becomes null and void. So if you recalc your reputation, all those votes are removed from your rep calculation.
You can still accept an answer on a closed question, but no further answers can be posted on it. Obviously, you can't do anything else with a deleted question except, under certain circumstances, you can undelete it if you are the owner and have more than 10K of rep. Community members with over 10K rep can also vote to undelete a question.
And so on.
Users with 10K rep can see deleted posts. Most deletions are really "soft" deletions; the post remains in the database, but is not viewable by the majority of community members.
Anyone with sufficient reputation can vote to reopen questions.
Also, if you've edited/improved your question and want to reopen it, you can probably ask moderators. That shouldn't be a lot of trouble for them.
Even if a question stays closed, it can be useful.
If it has been closed as a duplicate, or when it has been closed and moved to another site, then it can still serve as an entry point for people who happen to find it through Google or some other search. Those can then follow the "duplicate of" links to get to a similar question which is still open (and probably has answers), or are automatically taken to the other site when browsing to the the migrated question. Other closed questions tell people what questions are not welcome on the site.
In short: some closed questions stay closed, and have a future in helping people find their way.