Which type of Jira do I have?

When I started using Jira in 2011 there was only one type. But now there are different application types, like Jira Work Management (formerly Jira Core), Jira Software, and Jira Service Management (formerly Jira Service Desk), and different deployment types, like Jira Cloud, Jira Server, and Jira Data Center. If you have Jira Cloud, there are also different plans like Free, Standard, Premium, and Enterprise. How do you know which you have? Why does it matter?

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