Webinars are a form of online education whose purpose is to pass skills or knowledge across to those who want to learn. They are very useful and highly detailed in their nature and if they are explaining a concept, nothing will be left out of the explanations. Webinars are important in the modern world where putting together pieces of information in order to muster a skill or some knowledge becomes very hard and involving. However, the use of a webinar cuts down the costs and brings lots of benefits, even including making money with webinars.
Then you ask them follow up questions to make sure they understood your presentation, what they do not understand, what objections they may have, etc. etc. You will close more sales if you are able to get feedback from clients, and Webinars allow you to see their face, to hear their voice to know how they are feeling about you, your presentation, your company and your products and services.