What are the Tags for? Placemarks in Google Search

Hi,
can anybody tell me what are the tags for which i can add to a placemark in backend?
Are they shown anywhere on my site?

I´ve added over 500 placemarks on my site.
Is there a way i can pass them to google for my pagerank?

Hi.
I added tags for placemarks for future development. For example, add plugin call for tags, or add search ability bu tags. Now it is only plans to future.
You can't pass to google, but if google crawlers get your page, I think it will index it.