Googlebot
Googlebot is Google’s crawling robot. It discovers URLs, downloads pages, executes JavaScript in a second wave, then passes everything to indexing and ranking systems for processing.
In practice
Since 2019, it runs a recent version of Chromium: JavaScript is rendered, but with delay and a limited budget — content that depends on late client-side rendering indexes less reliably. Verifying the identity of a visitor claiming to be Googlebot requires reverse DNS resolution; impersonators are common in server logs.