Maintenance Plans are an Administration function within ShareDo. You can think of them like a UI-powered Cron Job.
Every instance of ShareDo comes with a handful of plans out of the box. Some are polling jobs, such as checking for new SMS messages. For example, using a third-party service to pull texts into the platform might run frequently, say every 15 minutes.
Other plans might involve keeping the platform tidy, such as cleaning up logs. A plan like this might run once daily or only every couple of days.

If you have a job or a task that needs to run regularly to check something or make updates, you might consider using a Maintenance Plan to run it.
Configuration
Maintenance plans are designed for simplicity; you choose a plan type and set a schedule.

You can add complexity by supplying additional configuration if needed.