iPod is a brand of portable media player designed and marketed by Apple Computer. Devices in the iPod family provide a simple user interface designed around a central scroll wheel (with the exception of the iPod shuffle). The standard iPod model stores media on a built-in hard drive, while the smaller iPod shuffle and iPod nano use flash memory. Like most digital audio players, an iPod can serve as an external data storage device when connected to a computer.

Discontinued versions of the iPod include two generations of the popular iPod mini and four generations of the full-sized iPod, all of which had monochrome screens except for the fourth-generation iPod with color screen (previously sold as iPod photo before it replaced the monochrome iPod in the top line). As of April 2006, the lineup consists of the fifth-generation iPod, which has video playback capabilities, the iPod nano which has a color screen, and the iPod shuffle; all three models were released in 2005. The iPod is currently the world's best-selling digital audio player[citation needed]. The bundled software required for uploading music, photos, and videos to the iPod is called iTunes. A music jukebox application, iTunes stores a comprehensive library of the user's music on their computer, and can play and rip music from a CD. The most recent incarnations of iPod and iTunes have video playing and organization features.

Apple's widespread marketing campaigns have led to the iPod's reputation as an easy-to-use, stylish device and dominance among the MP3 market (to the extent that some people erroneously refer to all MP3 players as "iPods"); this has led to a large market dedicated specifically to iPod accessories. Apple's proprietary actions regarding iPods and iTunes, however, have led to its criticism by some and legal battles outside of the United States.