What is QuickTime Broadcaster? Is it related to QuickTime?
QuickTime Broadcaster is an application that enables a live broadcast to someone who's connected to the Internet. The software uses standard input devices to capture the stream to broadcast it on the Internet. Once this is achieved, someone can easily type the address with the stream in its browser to view the live content.
There is a dedicated page provided by Apple which presents additional information: https://support.apple.com/kb/DL764?locale=en_US