# Bluetooth codec
> A Bluetooth codec is the format your phone and earbuds use to send wireless audio.
Topics: Audio, Connectivity
Difficulty: Getting technical
Aliases: SBC, AAC, LDAC, aptX
Updated: 2026-06-26T08:00:00.000Z
## Go deeper
A Bluetooth codec is the format your phone and earbuds use to send wireless audio. In everyday buying decisions, the useful question is not just what the spec says, but what it changes for comfort, cost, speed, safety, or battery life.