Reports vs Interfaces

Hi everyone, I just want to know more about the report object in Appian.

I have read all the theory available in Appian, but I still have some doubts. I want to show all data on a site, so I have created one main interface that has three sub-interfaces with KPIs in it. If I want to add this to a site, I have two ways: either I can add it as an interface or as a report. Then, what is the purpose of the report? There aren't many options; we just need to select the interface we want to show in the report

  Discussion posts and replies are publicly visible