Crawlability
The extent to which search-engine crawlers can discover, request, render, and follow the pages and resources of a website.
Poor crawlability prevents valuable content and updates from being discovered efficiently, wastes crawl resources, and makes technical SEO work ineffective.
A glossary exposes stable HTML links to every term, returns successful responses, avoids blocked rendering resources, and includes canonical URLs in an XML sitemap.
Crawlability does not guarantee indexation or ranking. A crawlable page may still be duplicate, low value, noindexed, or excluded by search-engine quality and canonicalization decisions.
Crawlability depends on reachable links, server responses, robots directives, authentication, JavaScript rendering, redirects, URL design, performance, and crawl capacity. A page must be accessible to a crawler before its content can be evaluated for indexing.
Systems Architecture
Google Search Central — Crawling and Indexing — https://developers.google.com/search/docs/crawling-indexing; Google Search — How Search Works — https://developers.google.com/search/docs/fundamentals/how-search-works