Documentation for JIRA 4.0. Documentation for other versions of JIRA is available too. 
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OAuth is a protocol that allows a web application to share data/resources with any other OAuth-compliant external application. These external applications could be another web application (such as a different JIRA installation or an iGoogle home page), a desktop application or a mobile device application, provided that they are accessible from within your network or available on the Internet.
For example, using OAuth, you could access your JIRA site's data through a JIRA dashboard gadget on an iGoogle page.
Key OAuth Terminology
The following pages contain detailed instructions on how to configure external applications to consume data from JIRA and how to configure JIRA to be a service provider. Additional information on OAuth is also available in our Gadgets and Dashboards documentation.