Teletank is like playing with a toy car but instead of using your fingers to move it, you can control it from far away using a special remote control. The car itself is also special because it has a camera and a gun on top of it that you can use to see and shoot things while you steer it around.
Now, imagine that this toy car is super big and strong, like a real tank! This is what a teletank is. It's a remote-controlled tank that can be controlled from far away to go wherever you want it to go and shoot at whatever you want it to shoot.
Teletanks were first invented a long time ago, during World War II. They were used in battles to go out ahead of the soldiers and see what was going on or to attack the enemy without putting the soldiers in danger. They were also used in some dangerous missions to transport supplies or help the injured soldiers.
Nowadays, teletanks are not used anymore because they have been replaced by more advanced technology. But they were a very important invention during their time, and many people still find them fascinating!