Rover
A Rover is any vehicle designed to traverse the surface of a planet, moon, or asteroid.
Rovers on the Moon
Unmanned
Lunokhod 1 and 2 were the first rovers to explore the surface of the Earth's moon.
Chandrayaan-II is currently under development by ISRO.
Manned
Several Apollo missions carried specially designed lunar rovers. These all-terrain vehicles greatly extended the range of the crew.
Rovers on Mars
Unmanned
Three rovers have successfully explored the surface of Mars: Sojourner, Spirit, and Opportunity.
The Mars Science Laboratory is currently under development by NASA and is planned for launch in the fall of 2011.
ExoMars is being developed by the ESA and is scheduled for a 2013 launch and 2014 landing.