A webinar is a combination of the words web and seminar. It is in many ways a digital seminar, but is used as an umbrella term for several services. Webinar is used for conference services, presentations, courses, and seminars online.
In a webinar, the participation of those who participate can vary. Participants can be listeners and submit questions or just listen. In smaller webinars, participants can be more active, for example in discussions or group work.
Webinars can be both paid or free. There are quite a few free webinars. They can, for example, be organized by companies, entrepreneurs, and educational institutions. Many offer free webinars to increase visibility, teach about their company or a topic. Many use Facebook when they are going to broadcast a webinar. This is because of good visibility in advance, and it is an easy way to organize.
You can also use webinar platforms where you send a registration link to the participants. This is also more common when you charge for registration or want to contact the participants afterwards.