A report is a type of saved search. When you create a search or pivot that you want to use later, save it as a report. You can run the report again by locating the report on the Reports listing page and clicking its name.
You can schedule reports to run on a regular interval. You can configure these scheduled reports to perform actions each time they run, such as emailing the report results to a set of project stakeholders.
You can accelerate slow-completing reports so that they finish faster, using either report acceleration or data model acceleration. Reports that do not qualify for report acceleration can be accelerated through summary indexing.
For more information
In the Reporting Manual:
In the Pivot Manual: