Google bot is a web crawler it tells google whats out there, it helps with rankings and speeds up searches. Basically when you search on google it doesn’t look at the live web, it looks at what the bot has seen, in other words the cached copies of the web pages that the bot has taken.
Here is an explanation http://www.googleguide.com/google_works.html old but the basics are there, google is very very clever (making them very very rich)
Mark wants the bot to crawl as it help people searching for information on Spanish Property find this site the more it crawls the further up the google search this site becomes.
hope that helps