What does RTR mean when on a radio controlled boat label?

I was looking at some radio controlled boats and some of them said RTR. What does that mean

RTR means that the boat should not need any technical knowledge to set up and run. Theoretically is should be operable right out of the box. In reality you generally need to adjust some things such as the servos and grease the drive shafts.

Many of the electric boats are truly ready to run out of the box. Most of the nitro and gas boats should get some break in time and preliminary maintenance.