What's the difference between the ATA hard drive and SSD in MBP?

I'm looking to buy a new MacBook Pro and am unsure of the real differences between the ATA hard drives available and the SSDs.  How would each affect my new computer? I realize many people suggest not buying these extra things through Apple for economical reasons, but lets just say I did, which would be the better option?

You don't have to give up anything for memory, that is handled by the ram...the amount of storage available in SSD is less than with a Hard Drive in large part because of the cost.  You gain speed but have to be content for now with less storage space.
Of course, you could buy an external hard drive to use for bulk storage and backups, always strongly recommended.  Some good drives are available from the Mac specialists at OWC, http://www.macsales.com
Those will not be as fast as the SSD but are great for letting Time Machine backup your internal storage and for use as a place to store bulk things like music or photos or videos, etc.

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