Indexing
Google storing and understanding a page so it is eligible to appear in results. Crawled is not indexed, and indexed is not ranked.
See it
What it is
After crawling, the engine renders the page (running your JavaScript), works out what it is about, dedupes it against near-identical pages, and decides whether it earns a slot in the index. Only indexed pages can rank. Search Console's Pages report is the ground truth: 'Crawled, currently not indexed' means Google looked and shrugged, usually at thin or duplicate content.
What keeps a page out: a noindex robots meta tag or X-Robots-Tag header, a canonical pointing at a different URL, a redirect, a 404 or soft 404, or content that simply is not worth a slot next to what already ranks. Note that robots.txt does the opposite of what people expect: it blocks the crawl, so Google can still index a bare URL from external links while never seeing the noindex tag inside.
Indexing is neither instant nor guaranteed. A new page can take days to weeks. You can nudge it: link to it from a page that already gets crawled often, put it in the sitemap, request indexing in Search Console. Volume is the enemy. Dumping 5,000 templated pages at once is the fastest way to have most of them sit uncrawled or dropped.
Ask AI for it
Diagnose why this page is not indexed, then fix it. Check for a noindex robots meta tag or X-Robots-Tag header, a canonical tag pointing at a different URL, redirect chains, a soft 404 (200 status with empty or error content), and robots.txt rules blocking the crawl. Confirm the main content is present in the server-rendered HTML rather than injected only after client-side JavaScript. Then add internal links from at least two frequently crawled pages and include the URL in the XML sitemap.