This task runs on a schedule defined by the user. Schedule expression follows linux cron expression syntax. It means that you can define any schedule you want!
You can also disable the schedule and run the task manually anytime you want.
Task might be useful when you want to perform specific, repetitive actions on the products, customers or orders or any other objects. For example, you will be able to make all products unavailable at 10PM and make them available again at 8AM.