What is Google Page Rank? And SEO?

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Dear members.... I was out of mylot for some M... And now I came here because I really, really need your help, regarding google page rank and about SEO. I've a Bible Blog. ''Godhubs'' Community Bible Study. And recently my blog address wasn't visible in google searches. But now-a-days my blog address is visible on the top 10 google search result. But unfortunately I don't know what is google page rank? And how to get google page rank? Should I upgrade my blospot sub-domain name to my own name godhubs . com for page rank? I found some information about SEO... But not aware about that . I've no knowledge about SEO, google page rank. Can anyone help me explain me clearly. Any responses are appreciated!