The command-not-found module is a feedback provider plugin for PowerShell. This feedback provider depends on the command-not-found utility, which is often available on Linux by default, to provide suggestions when a native command cannot be found.

bash also calls the command-not-found utility to provide suggestions when a command cannot be found. But this feedback provider plugin does more than that, thanks to the command-line predictor feature in PowerShell. It also implements the ICommandPredictor interface and serves as a predictor. When the resulted feedback contains actionable items, such as commands to run, they will be used as predictive suggestions to streamline the user's command-line experience.