VOX is a voice-activated intercom or radio. That is different to your own voice which is the sound produced by your vocal organs.

"Vox" is Latin for "voice." "Vox" is mainly used in FIXED EXPRESSIONS, such as the "vox populi," which means the "voice of the people." Such fixed phrases come into English directly from Latin. But "voice" is the word that English speakers use every day.

Also, within music and audio engineering, a lot of the time the vocals (anything to do with voices) will be referred to as "vox". For example, if a band is recording a song, they could say: "We've recorded all of the music for our song, now we just need to record the vox." But like everyone else said, I don't really hear the word "vox" used very much, except for in those very specific situations :)

"Vox" is Latin, meaning "voice." So, they are the same thing, but in different languages. Sometimes English-based companies will use vox in their product names, such as Vox Amps. Also, what Jura said about it being short for "voice-operated switch" is accurate.