A "webcast" is a live or recorded broadcast that is streamed over the internet. It allows people to watch or listen to an event or presentation in real-time or at a later time, using their devices like computers or smartphones. Full definition
I've written here and here about the Massachusetts Supreme Judicial Court's launch last spring of live webcasts of its oral arguments. (lawsitesblog.com)
TCTV.live hosts live webcasts of therapy sessions (and live supervision of these sessions!) (tctv.live)
On May 16, 2014 the Copyright Board released its decision certifying Re: Sound Tariff 8 setting royalty rates for webcasting services in Canada. (slaw.ca)