Messenger is a mobile application for messaging and calling, created by Facebook. The app was launched in 2011 and quickly became one of the most popular ways of communication worldwide. Messenger allows users to communicate with friends and colleagues through text messages, voice and video calls, as well as exchange photos, videos, and audio messages.

One of the main features of Messenger is the ability to create group chats, which can accommodate up to 250 participants. Users can also exchange stickers, GIFs, and emojis to express their emotions. The app also allows sharing location, recording voice messages, and sending money through the Facebook Pay payment system.

Messenger also allows users to create stories, which disappear after 24 hours. In stories, users can post photos and videos that can be viewed by their friends. Another useful feature of the app is the ability to set up an autoresponder that can notify people that you are temporarily unavailable.

Messenger is a very popular app due to its convenient functionality and wide range of features. The app is available on many platforms, including iOS and Android, making it accessible to most smartphones and tablets. Thanks to integration with Facebook, users can easily exchange messages with friends from the social network. Messenger also offers a high level of security, including end-to-end device encryption to protect users' personal data. Overall, Messenger is a convenient and multifunctional app that allows users to freely communicate with friends and loved ones using various means of communication.