App catalogs enable distribution of SharePoint add-ins, such as LiveTiles Design, Build, and Blueprint. In Office 365 SharePoint, installing the app catalog is a relatively automatic action - described in another support article. For on-premises, installing an app catalog is a bit more involved and has more numerous requirements. For a complete description of the process, please consult this Microsoft TechNet article on setting it up.
Modified on: Wed, Apr 19, 2017 at 4:54 PM
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