Crawlability is how easily automated crawlers can reach and read the content on your site. Good crawlability means crawlers are not blocked by robots.txt, are not stopped by login walls, and can access the actual content in the page's HTML rather than a blank shell.
For brands, crawlability is the gate before everything else in AI visibility. Research consistently ranks crawl access among the highest-impact factors, simply because content an AI cannot reach cannot be cited. The most common modern failure is client-side rendering, where content loads only after JavaScript runs and AI crawlers, which generally do not run JavaScript, see nothing. Server-side rendering is the usual fix.