A "webinar" is a Web-based seminar, lecture, workshop or a presentation that is transmitted via the Internet (online training sessions). 

The key feature of a "webinar" is the ability to combine verbal instruction, visual examples and 'do it yourself' capabilities allowing interaction between the presenter and the audience. 

Webinars occur over the Internet, so you don't have to travel in order to participate in one. You can take part in a Webinar from your desk. 

Webinars do not occur in real time, you can participate when you have the time, not when the speaker is ready. 

Handouts are maintained in PDF format, you don't have to print them; you can retain them as computer files to look at whenever you need them. 

All of the content of a Webinar is digital, it is easily archived. Long after the Webinar is over, you can still refer back to the discussions, the lectures, the resources, and other Webinar features. 

Community is at the heart of the Internet, Webinars offer an easy means for participants to engage with the speaker as well as one another. Using discussion group technology, all participants are able to explore issues and share knowledge far more effectively than they can in a live setting.