What is the crucial difference between using 'noindex' and using robots.txt to block a page from search engines?

The crucial difference between using 'noindex' and using robots.txt to block a page from search engines lies in how the search engine bots interact with the page and whether the page is crawled and indexed at all. Using robots.txt to block a page prevents search engine crawlers, like Yandexbot, from even accessing the page. The bot respects th....