Question

What is periscope? or Define periscope ?​

Answer 1

Answer: A periscope lets you look around walls, corners or other obstacles. Submarines have periscopes so that people inside can what is on the surface of the water.

                                                        Or,

Periscope is an iOS and Android app that lets you share and experience live video streams direct from your smartphone or tablet.

                                     Hope it will help you :)

Answer 2

Answer:

An optical instrument for viewing objects that are above the level of direct sight or in an otherwise obstructed field of vision, consisting essentially of a tube with an arrangement of prisms or mirrors and, usually, lenses: used especially in submarines. I hope this answer helps u. Mark me the brainliest.