I only know Mindstorms Ev3, which is an electric robotics set. You basically have a main brick, 15105 cm or smth, and motors and some sensors. You can plug it all together with phone wires (I believe), and program the main brick either with scratch(-like stuff), or python afaik. There are some official models you can build with it, eg. a car.

I prefer Fischertechnik’s Robotics TXT Controller more though, as Lego’s system is just yet another closed and very limited system, eg. only the official mindstorms motors are supported. It’s also more open, running an open source rom of Linux, and using the same +/- plug system for basic motors (+ support for servo and stepping motors) since the very beginning - from simple regulatable transformers in the last century over battery/accu boxes to simpler remote controlled boxes and the TXT controller. And it works with multiple remotes, the app or just by using python, the camera and object recognition. All which Lego also can’t do, to no surprise. And, of course, it wasn’t killed off to be replaced by a slightly different and therefore incompatible system.