postcss-url is a PostCSS plugin that provides powerful URL handling capabilities for CSS. It allows you to rebase, inline, or copy URL assets referenced within your stylesheets. Key functionalities include automatically adjusting paths for generated CSS, embedding images as data URIs, and copying assets to a build directory. This helps optimize CSS delivery and manage asset dependencies more effectively, improving website performance and maintainability. Flexible configuration options empower developers to tailor asset handling to specific project needs.