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I understand it has something to do with databases but I am not exactly sure what it does.. I looked on the android developer page and they don't explain it very well.

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I am not sure about the context but URI generally refers to Uniform Resource Identifier. See Wikipedia for more:

In information technology, a Uniform Resource Identifier (URI) is a string of characters used to identify a resource. Such identification enables interaction with representations of the resource over a network, typically the World Wide Web, using specific protocols. Schemes specifying a concrete syntax and associated protocols define each URI. The most common form of URI is the Uniform Resource Locator (URL), frequently referred to informally as a web address. More rarely seen in usage is the Uniform Resource Name (URN), which was designed to complement URLs by providing a mechanism for the identification of resources in particular namespaces.

wikipedia

Istvan
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