A robots.txt generator is a tool that automatically creates a robots.txt file for websites. This file instructs search engine bots which pages or directories should be crawled or not. The generator usually allows website owners to customize the instructions by specifying which robots are allowed, disallowed, or have limited access to certain pages or directories. The robots.txt file helps improve website security, increase crawl efficiency, and avoid indexing unwanted pages. By using a robots.txt generator tool, website owners can save time and ensure their website is optimized for search engine bots.