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A TOML (Tom's Obvious Minimal Language) is a configuration file format that is easy to read and write. It's a great feature of a modern Python project structure. The TOML file can live anywhere in a project's root folder. It can tell the runner how many concurrent jobs to execute, the log level, listening port, and many other options. For example, the popular headless CMS platform Netlify uses TOML files to upload build configurations to upload.