A multi chamber grow tent splits one shell into separate compartments, each on its own light cycle. That lets you keep mother plants or vegetative growth going in one section while the other flowers, so the next crop is already part-grown when you harvest the current one.
It is the same idea as running two tents, in a single footprint and with one set of ducting — useful when floor space is the constraint rather than budget.
Prefer two separate spaces? Compare the full grow tent range, or pair a main tent with a clone tent for the propagation side.