The w3m file extension is primarily associated with w3m, which is a text-based web browser and pager similar to Lynx or ELinks. The w3m file format is typically used to store user bookmarks, configuration settings, or session history for the browser. Because w3m operates directly inside terminal emulators and supports tables, frames, and even inline images in certain environments, its bookmark files maintain a structured list of saved URLs and associated page titles so users can easily revisit their favorite web locations without relying on a graphical user interface. The files are usually stored in plain text, making them easily readable, editable, and portable across different Unix-like systems where the w3m browser is installed and utilized by power users, developers, and system administrators.