iTunes
iTunes is Apple software for organizing and playing digital media, managing iOS devices, and accessing the iTunes Store.
iTunes Store: Apple’s digital storefront for purchasing and downloading music, films, television programs, and other media. The store was built into iTunes for browsing and buying digital media.
Media library: An organized collection of digital media files and descriptive information about them. iTunes manages tracks and other media as a searchable personal library.
SoundJam MP: A Macintosh digital music player and encoder developed by Casady & Greene. Apple acquired SoundJam MP and used its technology as the basis for iTunes.
Digital music distribution: The delivery of recorded music as digital files or streams through online services. iTunes helped make online music purchasing a mainstream distribution channel.
Music (Apple app): Apple’s app for playing and managing music, including access to Apple Music and personal libraries. On macOS Catalina, Music replaced iTunes’ music functions.
iPod: Apple’s portable media-player product line, introduced in 2001. iTunes libraries commonly supplied music for syncing to iPods.
ID3: A metadata format that stores information such as title, artist, and album in audio files. iTunes uses track metadata to sort, display, and search music.
Jeff Robbin: A software developer who co-created SoundJam MP and helped develop iTunes at Apple. Robbin led the software work that transformed SoundJam into iTunes.
Album-equivalent unit: A measurement that combines album sales with equivalent numbers of individual track sales or streams. The iTunes Store’s track-by-track sales challenged the album as the default purchase unit.
Apple TV app: Apple’s app for watching purchased, rented, and streamed video content. It took over much of iTunes’ video playback and library role on newer Apple systems.