What is the role of "pyproject.toml" in Python projects?

In simple terms, "pyproject.toml" is a configuration file used in Python projects, primarily used for managing build tools and dependencies. It's used for defining the project's metadata, specifying build dependencies, and configuring tools like `pip`, `setuptools`, and `tox`.

With it, you can specify various project settings, such as the Python version, build requirements, and more. The file also helps create reproducible builds and simplifies dependency management across different Python packaging tools.