live_entity: Live entities are basically live events, with or without a live feed. A live entity contains the information required for Uiza to allocate resources to power the live event, and direct your live feed toward these resources for ingestion and broadcasting.
live_session: The duration of one session is counted from the moment Uiza receives the first signal until the last of that live feed. Therefore, one entity could contain multiple sessions. The durations of these sessions are calculated as Live Minutes in your billing.