What is instagram vanish mode?

Instagram Vanish Mode is a new messaging feature that allows users to have a more private and ephemeral conversation with their friends. When activated, messages sent in Vanish Mode will disappear once they are viewed and the chat is closed. This feature is similar to Snapchat's disappearing messages and is aimed at providing users with a more secure and temporary way to communicate. Vanish Mode is currently available in select countries and is gradually being rolled out to all Instagram users.