Simulated Live broadcasts allow you to use a pre-recorded video and schedule it to play at a specific time as a live online event.
The main difference between simulate live and having a video file that someone can play on-demand, is that all viewers who visit your page view the same stream at the same point in time. For example, if a simulated event starts at 10:30 AM, and someone joins your broadcast at 10:40 AM, they will join the feed at the point where everyone else is viewing the feed.
Since the simulated live feed is synchronized for all viewers, your viewing community can interact with your content in real time via features such as live moderated chat. Simulated Live functionality also allows you to re-broadcast the same video at different times.