rustfmt is an automated tool designed to format Rust programming language code according to standardized style guidelines. By automatically adjusting indentation, spacing, and other formatting details, rustfmt ensures that Rust code is consistently styled and easy to read across different projects and contributors. This helps teams maintain clean codebases, reduces code review time spent on style issues, and makes open-source collaboration smoother. Rustfmt can be integrated into development workflows and editors, making it easy to enforce code style without manual effort.