In brief: Indexing is the storage and organisation of information so that a system can retrieve it quickly later. In a search engine, it follows the discovery and processing of a page.
How I use indexing in practice
I begin with the actual output, not a setting in administration. I verify the URL, status response, HTML, behaviour without JavaScript and the user journey on mobile. Then I review logs or tools, identify the impact on important pages and rank fixes by risk. One verified URL is often more useful than a long export without context.
What to watch for
A common mistake is to confuse a declared setting with real behaviour. For indexing, I always test the final response and more than one address variant. An automated crawler can find a pattern, but it cannot determine the business priority or the right replacement content.
Questions for decisions
- What exactly does the server return, and what does a person see at the important URL?
- Is this an isolated error or a pattern in a shared template?
- What is the impact on discoverability, use or conversion?
- How will we test the change before a full rollout?