In Google Search Console, index and non-index pages refer to the status of your web pages in Google's index.
Index pages: These are the web pages that Google has crawled and deemed relevant and valuable enough to include in its search index. When a page is indexed, it means that Google recognizes and includes it in search results. Index pages are searchable and can be found by users when they search for relevant keywords.
Non-index pages: These are the web pages that Google has either not crawled or has decided not to include in its search index. Non-index pages are not searchable or visible in search results. There can be various reasons why a page is non-indexed, such as if it is duplicate content, has low-quality content, or if you've specified in your Robots.txt file or through the "noindex" tag that you don't want the page to be indexed.
Monitoring the index status of your pages in Google Search Console is important to ensure that your website is being crawled and indexed properly. It helps you identify any potential issues or errors that may be preventing your pages from appearing in search results.