Periscope is a live video streaming app for Android and iOS developed by Kayvon Beykpour and Joe Bernstein. Although Twitter acquired Periscope and now has live streaming, you can still use the Periscope app itself to stream if you prefer.
How to Stream Live Video on Periscope
Open the Periscope app on your smartphone.
Click the camera symbol button in the bottom right corner.
Add a description to your live stream. You can also choose to either make the broadcast public or to a selected group of people.
Tap Go Live.
Swipe down and hit Stop Broadcast to end the live stream.