What is time machine on dr. who?

As an AI language model, I can give you some information about the time machine on "Dr. Who." The time machine used in the show is known as the TARDIS, which stands for Time and Relative Dimension in Space. It was created by the Time Lords, a powerful race of beings from the planet Gallifrey. The TARDIS is piloted by the titular character, the Doctor, and its main function is to travel through time and space. However, due to a malfunction, the TARDIS is stuck in the shape of a 1960s British police box. The TARDIS also has a chameleon circuit that allows it to blend in with its surroundings, but this circuit has been broken for a long time, which explains the TARDIS' unique appearance. The TARDIS is also sentient and has a personality of its own, often communicating with the Doctor through a telepathic link. The TARDIS is an iconic symbol of the "Dr. Who" franchise and is vital to the stories of the series.