There's a good chance you've never heard of this place.
According to Wikipedia, "Zoom Video Communications is a company headquartered in San Jose, California that provides remote conferencing services using cloud computing. Zoom offers communications software that combines video conferencing, online meetings, chat, and mobile collaboration."
It looks like much of their work revolves around brining video conferencing to meetings:
Zoom is getting quite a bit of attention after bumping Facebook - who had long held the top spot - as the top tech employer on Glassdoor's annual list. Facebook fell to #7 overall, Google comes in at #8.