These days, everyone has a phone in their pocket that can stream and download music, but two decades ago, that wasn't the case. If you wanted to listen to your favorite songs on the go, you needed a dedicated music player.

At the turn of the millennium, these devices either used tens of megabytes of expensive flash memory or pocket-stretching and power-hungry 2.5-inch hard disks. Years before the iPhone, the iPod offered an unbeatable combination of storage size, compact dimensions, and software support, arguably starting a new journey that turned Apple into the company it is today.