bots?

i was wondering that when a bot comes to visit, how he see the site? i mean as a guest? cuz i have somethings that only appears to guest and others that not appears to guests, what about the bot?
and another thing, lately on my forum the google bot is visiting atleat 10 times in a day on different occasions,
what are the main purpose of bots to visit?

Bots search for useful content, and logs it, then indexes it on search engines. They gather information that would lead people to your site, through keyword searches and queries.

so is it good to have them visit ur site more often right?

Yes. Have you seen how long bots stay on the support site?

Here? omg i think they live here lol
all the time

And so that shows bots are a good thing. Anyway, you would like more members, and so bots get the important stuff onto search engines, then people find it and maybe join your forum.