Report Categories allow you to organize your Reports.
Organization.
There are three default Report Categories: Client, Installation, and Management.
You can add/edit/delete Report Categories in the Report Explorer interface:
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When you choose to create a new Report Category, the Add Category form will open for you to name the new Category and select the Reports that you want to be in the new Category:
The Reports that you add to the new Category will be displayed under the [Other] button on the Reports tabs throughout SI 2015:
When you choose to edit a Category, the following form opens where you can check/uncheck any reports:
You can also drag and drop reports from one category to another in the Report Explorer interface: