Wouter is a minimalist-friendly routing library for React and Preact, designed to be lightweight at just 2.1KB gzipped compared to React Router's 18.7KB. It provides familiar components like `Route`, `Link`, `Switch`, and `Redirect` while embracing React hooks for granular control over routing. The library supports both React and Preact, offers nested routing, and includes features like route parameters, query strings, and base path configuration. It's ideal for developers seeking a simple, fast, and hook-based routing solution that stays out of the way while providing essential navigation functionality.