Manual Bowl Lift
The most common variety, manual lifts raise and lower the bowl via a wheel or lever. On some smaller countertop planetary mixers, however, the bowl does not move. Rather, the entire upper housing of the mixer, mixing device included, tilts back and permits access to the bowl.
Electric Bowl Lift
As the name implies, this system raises and lowers the bowl automatically with buttons or a similar interface. This is more common on larger mixers with larger mixing bowls.