It's very simple. In a brick-and-mortar store, people can feel, touch, and try products. You have to give them a similar experience online if you want to delight customers. When people can see your product in action, in real-time before they buy they will be more certain of what they are getting.
When customers put your product in their cart, they are worried they may be underwhelmed when they get it so they change their minds. This is where some cart abandonment comes from.
Customers return things because pictures and descriptions can only go so far to help them to understand your product. Many products are a great fit for being demonstrated during a live stream a few times a week.
Live streaming also increases revenue because you can close the sale live and it reduces cart abandonment. Contact a team member for more context.