Google has multiple web crawlers, Googlebot is the most known one. Google also has some special-case-crawlers that do not respect the global robots.txt user agent (*), and they need to call out explicitly.
Google’s Crawlers:
- Googlebot Smartphone
- Googlebot Desktop
- Googlebot Image
- Googlebot News
- Googlebot Video
- Google-InspectionTool
- Google-Extended
Google’s Special Case Crawlers
- AdsBot Mobile Web
- APIs-Google
- AdSense
- Mobile AdSense