URL rewriting is a technique used to modify the appearance and structure of website URLs. It is commonly implemented to make URLs more user-friendly, improve search engine optimization (SEO), and enhance website navigation. URL rewriting can be achieved through various methods, such as using server-side scripts, .htaccess files, or content management system (CMS) plugins. These tools or techniques allow webmasters to rewrite URLs to be more descriptive, concise, and easier to remember.