Broadcast

http://scratch.mit.edu/projects/23298218/
I would describe broadcast to someone else by saying that it is a more straightforward way of making a conversation back and forth between sprites. Instead of using the wait blocks and having it be messy you use the broadcast and receive blocks which make talking back and forth a lot smoother and cleaner. When one sprite says something that you want another sprite to respond to, you simply put the broadcast block after what one sprite said and then on the other sprite you use the receive block and then what they respond with.