What is a memory bank? Same thing as a slot for a memory module?

I'm confused with memory bank, memory module, slots on the motherboard, two-sided memory modules, single-sided memory modules.
I'intending to purchase an ASUS A7V8X-X and in the manual one can read: "MEMORY: PC 3200 maximum to 2 banks only; PC 2700 maximum to 4 banks only".
This motherboard has 3 memory slots. How can it have 4 banks? Then, they are not the same thing.
For me, practically, I'd like to know what I have to purchase in terms of memory modules, aside from the brand. If a two-sided module (chips on both sides) means 2 banks, and if a single-sided module (chips on one side only) means 1 bank. If this is correct, I'm starting to understand.
Thanks and regards
amsmeloAsked:
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sunray_2003Commented:
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sunray_2003Commented:
Thanks

Sunray
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