Irssi is a popular terminal-based Internet Relay Chat (IRC) client designed for Unix-like operating systems. It allows users to connect to IRC networks, join channels, and communicate with others in real-time. Its lightweight design and customizable features make it a favorite among users who prefer a text-based interface. One of the key features of Irssi is its support for scripting, which enables users to extend its functionality through various plugins. This flexibility allows for personalized user experiences, making it suitable for both casual users and advanced programmers looking to enhance their chat experience.