A 301 redirect is a permanent redirect from one URL to another. It informs search engines and browsers that the original page has moved to a new location, ensuring that users and search engines are directed to the correct page. This helps maintain the website's SEO value by transferring link equity from the old URL to the new one. When a 301 redirect is implemented, visitors who try to access the old URL are automatically taken to the new URL without any extra steps. This improves user experience and prevents broken links, making it an essential tool for website management and updates.