Facebook Messenger (commonly known as Messenger) is an American messaging app and platform developed by Facebook, Inc. Originally developed as Facebook Chat in 2008, the company revamped its messaging service in 2010, and subsequently released standalone iOS and Android apps in August 2011 and standalone Facebook Portal hardware for Messenger-based calling in Q4 2018. Later on, Facebook has launched a dedicated website interface (Messenger.com), and separated the messaging functionality from the main Facebook应用程序，允许用户使用Web界面或下载独立应用之一。 2020年4月，Facebook正式发布了Messenger for Desktop，该Messenger在Windows 10和MacOS上得到了支持，分别在Microsoft Store和App Store上分发。
用户可以发送消息并交换照片，视频，贴纸，音频和文件，以及对其他用户的消息做出反应并与机器人进行交互。该服务还支持语音和视频通话。独立应用程序使用多个帐户支持，可选的端到端加密对话以及玩游戏。
