Dolby Atmos is an advanced surround sound technology, popularly classified as immersive sound. The most visible difference compared to traditional formats, such as 5.1 and 7.1, is the addition of height channels, usually reproduced by speakers installed in the ceiling or reflecting sound upwards, creating a three-dimensional sphere of audio around the listener. Technically, the system's major innovation is the concept of object-based audio. Unlike conventional mixing where sound is directed to a specific speaker, in Dolby Atmos the engineer positions the sound in a virtual 3D space. The system uses metadata to calculate in real-time which speaker should play that sound based on the configuration available at the location. This ensures that the same mix works perfectly whether in a cinema with 64 speakers, a home theater system, or even standard headphones, where it uses binaural processing to simulate spatiality.