Tenants are different organizations managed by a Managed Service Provider (MSP), or different organizational units within a company. They are defined by their specific instance of Microsoft Azure, or Google workspace.
This is a powerful dimension, especially for MSPs as it allows them to have one login, and manage all of their clients. It also helps larger organizations keep all of their data centralized.
Department based analytics are based on the specific department assigned to the user as dictated by the azure connection, google workspace, or CSV upload.
Department specific data can help provide meaningful insights about each department. Which can be used to make decisions, especially related to access control.
This is using data based on what users are assigned a specific location, as specified in your Microsoft azure, google workspace, or CSV Upload of User Data.
Location specific data can help you make judgements about how secure each location is, however it can also be used to help identify locations with a stronger security culture.