Lego robots are programmed robots consisting of LEGO bricks. We can create different models of robots like animals, machines and can programme their operation. They can be programmed for speaking, doing many works and so on. For programmed robots, you need a tech to control the robot. You must connect the tech with the robot. There are many ways to connect the tech with a robot, but it depends on the sort of the robot (Wi-Fi, Bluetooth…). They are funny toys and a source for learning programming. Currently the most popular robots are Mindstorms EV3. They are from LEGO Technic bricks.
There are also many competitions name LEGO Masters.
It is my favourite (R3PTAR).