Looking at Doordash’s 10k filing. how can i find their definition?

Looking at Doordash's 10k filing, their section on Revenue shows this

https://imgur.com/a/csRMxRs

basically saying all their revenue is from their core business. which is “primarily comprised of Marketplace, which includes Pickup and DoorDash for Work, and Drive.”

but wat does that mean?

i dont know how to find out how they define that.