Discord is an instant messaging and VoIP social platform which allows communication through voice calls, video calls, text messaging, and media and files. Communication can be private or take place in virtual communities called "servers". A server is a collection of persistent chat rooms and voice channels which can be accessed via invite links. Discord runs on Windows, macOS, Android, iOS, iPadOS, Linux, and in web browsers. As of 2024, the service has about 150 million monthly active users and 19 million weekly active servers. It is primarily used by gamers, although the share of users interested in other topics is growing. As of March 2024, Discord is the 30th most visited website in the world with 22.98% of its traffic coming from the United States.

Instant messaging (IM) technology is a type of online chat allowing immediate transmission of messages over the Internet or another computer network. Messages are typically transmitted between two or more parties, when each user inputs text and triggers a transmission to the recipient(s), who are all connected on a common network. It differs from email in that conversations over instant messaging happen in real-time. Most modern IM applications use push technology and also add other features such as emojis, file transfer, chatbots, voice over IP, or video chat capabilities.