A Live Webinar happens at a specific time, or on a recurring basis.
Live Webinar features includes: HD Audio & Video, HD Screen sharing, Recording, Play videos, Present files, Whiteboard, No limit on presenters, Embed into your website, Call to Action Popups, Public & private chat, Q&A and upvoting, Polls & quizzes, Handouts and the ability to Host a Twitter chat.
To create a Live Webinar :
In the upper right corner of the home screen you will see the 'Create Webinar' button, select Live Webinar
Once you select Live Webinar you will fill out the webinar details
When the webinar is created you will be taken to the webinar's dashboard, here you can Edit settings for the webinar, add and/remove Presenters, Design the landing page, Set up Emails and Invitations, Manage the webinar, add Automations and take advantage of Integrations.