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When your browser requests a web page from a server via HTTP, it sends a set of headers with various bits of information about itself. Below you can see the headers sent by your browser.
HTTP headers supplied by your browser (ec2-54-158-248-219.compute-1.amazonaws.com):
Host: pgl.yoyo.org
Accept-Encoding: x-gzip, gzip, deflate
User-Agent: CCBot/2.0 (http://commoncrawl.org/faq/)
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
NB: If you see a header named "Referer" and are wondering why it's spelled incorrectly, it's because the original specification for HTTP/1.0 got it wrong, OK? Please stop asking me about this. From RFC 2616: "The Referer[sic] request-header field allows the client to specify, for the server's benefit, the address (URI) of the resource from which the Request-URI was obtained (the "referrer", although the header field is misspelled.)".