From Longman Business Dictionary
webinarweb·i·nar /ˈwebɪnɑː-ɑːr/ (also web-based seminar) noun [countableC] computing a talk, lesson etc that is given on the Internet, in which all the people taking part look at the same information on their computer screens, and can talk to each other, usually using their telephonesThe Academy will host a free webinar on how to get a small business loan.