Indexing

Indexing is the step after crawling. A search engine fetches a page, processes it, and decides whether to store it in its index. Only indexed pages can appear in results. Being indexable means nothing blocks it, such as a noindex tag or an error. Being indexed means it actually made it in.

The two aren't the same. A page can be indexable and still not indexed, because Google decides what to keep based on quality, duplication and how it found the page. You can check a single page with the URL Inspection tool in Google Search Console. A site: search is a rough check only.

Practical point: if a page isn't indexed, look at the cause. It might be noindex, a canonical pointing elsewhere, thin content, or no links to it. Resubmitting rarely fixes a quality problem. For link building, a link on an unindexed page is unlikely to do much, so confirm indexing after publication.

LinkHatch's receipts record whether a link is indexed.