The ambience element of music, also referred to as background or atmosphere or atmos is a term in film making and music that highlights the sounds of a particular area or location or space.
It is in such a way that it separates how the sound a particular music would bring in different tones in different environments or places.
Ambient sound is environmental sound or noise, background sounds appropriate to the physical space being depicted, such as crickets, water or birds. It extends the physical space, sometimes beyond what we can see in the frame. So, if you were writing music for a film and the location was in the woods, you would use things like birds chirping and leaves blowing in the air.
