What are Platform Standard View Usage Reports?

Article 3: (https://www.projectcounter.org/appendix-glossary-terms/)
Standard Views:
Standard Views are a set of pre-filtered views of the Master Reports covering the most common set of library needs. Report IDs for Standard Views are derived from the Report ID of the Master Report that they are based on. The format is “MasterReportID_ViewID”.

Platform Usage Standard Views:
There's only one Platform Standard View usage report. It's derived from the Platform Master Report and provides a summary of activity on a given platform to support the evaluation of platforms and to provide high-level statistical data to support surveys and reporting to funders.
Report_IDReport_NameDetailsHost Types
PR_P1Platform UsagePlatform-level usage summarized by metric type.“All”

Source: https://www.projectcounter.org/wp-content/uploads/2017/08/COUNTER-Code-of-Practice_-Release-5_July-2017.pdf    - Page 11