Video games are electronic games played by human interaction with a user interface to generate visual feedback on a display device. The first commercially sold video game was Computer Space in 1971. Video games have evolved greatly over time driven by advancing gaming technology. There are different classifications of video games including casual games which have simple rules, serious games designed to convey information or learning, and educational games aimed to help students excel in certain subjects. Some popular current video games mentioned are Red Dead Redemption, Call of Duty Ghost, Battlefield 4, and Little Big Planet.