I am reading "Ricky Rocket" by Shoo Rayner with my son.
"These are radio aerials, " she told them. "That's a docking bay. Mind those ladder rings please...don't trip over them!"

What does "docking bay" mean?
JigneshbharatiWhat does "docking bay" mean?

It is a relatively large fictional room inside a fictional spaceship that has fictional doors that open on outer space to allow other fictional spacecraft to come in for a landing or go out. We haven't built any spacecraft like that yet. We do have docking ports, fixtures embedded in the skin of a spacecraft to allow another one to mate with it.