What is a round robin in tennis?

Not being a Tennis Fan, I might offer some side information as the term was used in Slot Racing. in a normal race, there were eight lanes or tracks- the Orange ( they were color coded) had the tactical advantage. to minimize this, the Round-Robin rules required racers change lanes after each qualifying heat- left to right, or something like that. It was time-consuming as one might guess. Anything involving a rotation of duty orders- or a similar practice where players exchange positions ( this is or was done in skeet shooting) might be given this name. Origins are obscure, but the Robin is a migratory bird!