Which laptop/netbook/tablet should I get?

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1. Whats the difference between a laptop/ netbook/ notebook and a tablet( that runs on the same OS, not taking the weight and size of a tablet into consideration.)

2. What laptop (I'll just use this term to refer to a "portable computer" that I'm looking for) runs Google Chrome, Microsoft Office, and Itunes? (is that too much to ask for?)

3. What is the price range for such laptops? (Is there any that falls under the $500 category- i guess laptops dont really count anymore)

4. Whats the difference between RAM and a hard drive?

I'm not especially tech-savvy so please use layman terms. Thank you!