Particularly useful for sports fields, mowing in multiple zones allows you to program the same robot to work differently on several areas of your grounds.
Take, for example, two football pitches situated next to each other. One may be used for matches while the other is more dedicated to trainings. You can then ask your robot to intervene at different times in each area. For example, let it mow the training ground when it is not occupied while the other field is used at the same time to play a game.