A 2D platformer is a type of video game where players control a character that moves through a two-dimensional environment. The gameplay typically involves jumping between platforms, avoiding obstacles, and defeating enemies. Players often collect items or power-ups to enhance their abilities as they progress through various levels. These games are characterized by their side-scrolling or top-down perspectives, allowing players to see the entire play area at once. Popular examples of 2D platformers include titles like Super Mario Bros. and Sonic the Hedgehog, which have become iconic in the gaming industry.