the.com/audio
Everything you hear, captured and shoved through a wire to your ears.
means Sound, or the electronic signal and equipment that records, transmits, and reproduces it.
from From Latin audire, to hear, coined in early 1900s as a tidy English prefix when radio engineers needed a word for the sound half of things.
Sibling wordVideo, its visual twin, came decades later.
Hearing rangeHumans catch 20 to 20,000 hertz, fading with age.
Stereo trickTwo channels fool your brain into spatial depth.