Take a slide presentation and put it online: that's the essence of the webinar (slides and audio) or webcast (slides, audio and video). Visually, the content is delivered slide by slide in the online equivalent of a live presentation. The audio component can be delivered via telephone or computer. A webinar generally refers to slides and audio only. A webcast usually involves video.
Webinars make an excellent call-to-action or follow up offer to other forms of content, such as ebooks, white papers, enewsletters, etc. You benefit twice: first, from the live webcast, then from the people who download the archived event. According to Penton Media, Inc., about 80% of total registrations to a webinar attend the live or archived event over a six month period A successful webinar requires an aggressive promotions strategy, typically via your website, blog, newsletter and other media or social media channels