We usually use the word "instance" to talk about a single Jira installation.
Imagine I download Jira. I take the installation files and copy them to three computers and run them. At the end of the installation, I have three separate "instances" of Jira. Three separate urls that they run on and isolated data-sets.
Now imagine that I convert them to a Data Centre installation. Each instance becomes a node in the DC. I now only have one "instance" because there's only one url and one collection of projects, users, etc.
Hello folks! To the member of organizations who are still running their Atlassian applications on the server, we are on the side of the bridge, and if we need to sail the boat with confidence either...
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