What is Periscope?
Periscope is Twitter's new live-streaming video app, not to be confused with the recently launched Meerkat, also a live-streaming app. It allows you to watch and broadcast live video from all across the globe, meaning you could switch from watching a peaceful wander across the beaches of Cornwall to a protest in Egypt.
One of the key differences between the two is that Periscope saves the video streams once you are finished, so that anyone can view them for up to 24 hours; Meerkat's live video disappears once you choose to end the broadcast.
Both Meerkat and Periscope are pre-dated by other attempts at live-streaming apps, all of which fell by the wayside. But now, with more open Wi-Fi networks and faster 4G mobile networks than ever before, live streaming looks set to become as regular a part of our lives as Googling and Snapchatting.