How it works
Crawlability is the ability to discover and request a resource. Ordinary links with an href, a functioning server and suitable robots rules form the foundation. Rendering is another step: a crawler may download a page yet fail to see its meaningful body if the content depends on an unreliable script or inaccessible embedded document.
A realistic example
A glossary index that changes every card into a JavaScript click handler may work for a mouse user while exposing few ordinary links. Give each term a real link to its canonical language URL. The script can still enhance filtering, but the underlying path must remain discoverable and usable without that enhancement.
What to check
Follow links from the homepage to the relevant index and then to a term. Check redirects, response codes and robots rules at each step. Inspect the initial HTML for the main content and links, then compare the rendered page. A sitemap can help discovery but should not be the only route to important pages.
Limits and next steps
Do not solve a content-quality problem by adding more crawlable duplicate URLs. Use one stable URL for each language variant, link related terms deliberately and return genuine error statuses for missing pages. Review crawl evidence separately from indexing: successful fetching alone does not mean a search engine selected the page.