Nodemon is a widely-used, open-source utility tool for Node.js applications that automatically restarts the server whenever changes are detected in the source code files, streamlining the development process by eliminating the need for manual restarts. It can be installed globally or locally as a development dependency and is configured via CLI commands, a nodemon.json file, or directly in the package.json file. Nodemon supports custom configurations such as monitoring specific directories, ignoring certain files, setting restart delays, and watching specific file extensions. It can also be used to run non-Node code and allows manual restarts by typing "rs" in the terminal. Its features include piping output to files, adding default executables, and triggering events on state changes, with the flexibility to work as a module for extended functionality. Nodemon enhances the developer experience by speeding up iterations and reducing downtime during development, with additional resources and documentation available for more advanced configurations and troubleshooting.