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Third class mail is printed material that qualifies for a reduced postal rate. Third class mail is often junk mail or advertisements that don't take priority over other mail.
http://answers.ask.com/Society/Other/what_is_third...
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First class is just a an insured type of mail through the United States postal Office, and can be cards, packages, or advertisements; generally light weight objects.
http://answers.ask.com/Society/Government_and_Law/...
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The price of first class mail is dependent upon a couple of things. It depends where the package is leaving from and it also depends on where the package is going.
http://answers.ask.com/Society/Government_and_Law/...
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First class mail is usually received in 2 or 3 days. For more information go to
http://answers.ask.com/Society/Other/how_many_days...
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