What is a HeadlessChrome user agent?

Silvestar Bistrović - Sep 10 '22 - - Dev Community

Here's what I get when I inspect user agents visiting my site:

Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/92.0.4512.0 Safari/537.36
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/91.0.4472.114 Safari/537.36 Prerender (+https://github.com/prerender/prerender)
...
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What does this prerender thing mean? What does this HeadlessChrome mean? Are all of these bots?
FYI, I am using Netlify as my hosting.

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