Googlebot Crawl Budget refers to the number of pages Googlebot will crawl and index on a website within a given timeframe. It is determined by a combination of crawl rate limit (how fast Googlebot can crawl without overloading the site) and crawl demand (how often Google wants to crawl the site based on popularity, changes, and new content). Managing and optimizing the crawl budget is essential for large websites to ensure that important content is discovered and indexed efficiently, improving SEO performance and site visibility in search results.