R2 travelled to the ISS in February 2011 on the space shuttle Discovery's final mission.
Robonaut 2, or R2 for short, is a robot who works on the ISS. It is able to use the same tools and controls as humans because it is a similar shape and size and has human-like hands, which include touch-sensitive fingertips.
R2's arms move at less than 2 meters per second.
R2 can be remotely edited by people on the ISS or back on Earth.
R2 can carry out instructions autonomously (without being remotely operated), which is crucial for future robots like R2 who will be working at great distances from the Earth, for example on Mars, where there may be breaks in communication.
Building a humanoid robot that can work in space has been a 15 year project.
There is a robot called Robonaut 2, R2 for short, working on the International Space Station alongside humans.
Robonaut 2 is working on the International Space Station, which is orbiting the Earth.
You can follow Robonaut 2 on Twitter @AstroRobonaut and you can sometimes see it in action on the NASA ISS live stream.
R2 was designed and built by NASA's Robotic Systems Technology Branch.