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 2021, the service has over 350 million registered users and over 150 million monthly active users. It is primarily used by gamers, although the share of users interested in other topics is growing. As of September 2023, Discord is the 35th most visited website in the world with 23.42% of its traffic coming from the United States.