Compsys, or completion system, is a key feature in Zsh that enhances user experience. It provides suggestions for command completions when the tab key is pressed. This includes commands, file names, options, arguments, and more. Compsys uses a set of rules defined by the user or defaults to provide these suggestions. These rules can be customized extensively, allowing users to tailor their environment to their needs. The compsys also supports context-sensitive completions, meaning it understands the current state of the shell and offers relevant suggestions.
