Many different robots have different purposes. The Roomba is a robot vacuum cleaner, it drives around the room vacuuming everything.
Twendy-one is a robot that helps disabled people do everyday things, it can also be a great companion, since it can talk.
QRIO is a robot that is a great companion, he talks, he can play soccer, and moves swiftly like a human.
HRP is used to work in human environments, ranging from household work to industrial work.
PaPeRo is used to both help and entertain people, he can control household devices, and even responds to users.
AIBO is a great robot pet that will not die, He starts acting like a puppy and his character evolves as you raise him. He can find his charging station when his battery is low and he will notify you by email if he sees someone he doesn't recognize, he will notify you by email.