ReportServer DB vs ReportServerTempDB

Difference between ReportServer Database and ReportServerTempDB in SSRS

S.No	ReportServer Database	ReportServerTempDB
1	What it stores ? It Stores information about the report schema, report property, data sources, parameters, stores the folder hierarchy, report Execution log.	What it stores ? It stores only the cached copy of the report data.
2	How long it exists ? It always exists until changes on the RDL Schema.	How long it exists ? It expires based on Expiry settings.
3	How it helps ? It helps to access the structure.	How it helps ? It helps to improve the performance of report execution as it is loading data from cache.
4	Whether data will exist during / after service restart ? Data always exists during SSRS service restarts.	Whether data will exist during / after service restart ? Services restarts will clear the Temp Data.