Application Links (sometimes called "AppLinks") is a bundled plugin that allows you to link your JIRA
applications. Linking two applications allows you to share information and access one application's functions from within the other. For example, if you link JIRA and Confluence, you can view JIRA issues on a Confluence page via the JIRA Issues macro
. You can even link your individual projects, spaces and repositories with each other, across the different applications.
The Application Links plugin is bundled and shipped with the Atlassian applications. You cannot install it yourself.
The quick start guide describes how to set up an application link between two applications with two-way Trusted Applications authentication: