Spatial audio covers anything from using more than standard left-and-right speakers in a physical space to mixing in 3D binaural for headphone listening to using modern positional audio such as Dolby Atmos or game engines to make the movement of sound dynamic around a space. I'm an advanced user of spatial audio techniques, including recording and mixing in ambisonics (static 3D sound capture), using spatialisation plugins like IEM Suite, L-ISA and Envelop for Live, and using game engines like Unreal Engine to link sound to objects in digital environments.