Glossary
Apex domain
The root host (example.com) without a www subdomain.
Definition
Pick apex or www as canonical and redirect the other. Split hosts dilute crawl and citation signals.
In practice
- Use precise language on public pages so assistants and crawlers share the same meaning
- Pair definitions with crawlable HTML, metadata, and intentional robots policy
- Measure outcomes (mentions, citations, pillar scores) after you change signals
See also
Next step
Browse the glossary index, read what is AI visibility?, or measure your site.
Related
FAQ
What is Apex domain?
The root host (example.com) without a www subdomain.
Why does Apex domain matter for AI visibility?
Pick apex or www as canonical and redirect the other. Split hosts dilute crawl and citation signals.
How can BatSignal help?
BatSignal measures crawl access, content readiness, ChatGPT presence, and related signals so teams can improve AI visibility with evidence—not guesswork.