Just like Nic said your question is quite vague and there are so many ways to export specific issues, entire projects or the entire JIRA Database.
If you are trying to export your entire JIRA Database so that you can import it to another JIRA Database: See this documenation page if it provides what you're looking for https://confluence.atlassian.com/display/JIRA/Backing+Up+Data. You can either make an SQL dump or use the xml backup utility in JIRA following the steps in the documentation.
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