A chat server is a computer system that enables real-time communication between users over the internet. It allows multiple users to send and receive messages simultaneously, often in the form of text, voice, or video. Chat servers are commonly used in applications like instant messaging, online gaming, and social media platforms. These servers manage the flow of messages and ensure that they reach the intended recipients. They can support various features, such as user authentication, message storage, and group chats. Popular examples of chat servers include Discord, Slack, and Microsoft Teams.