Terminology

I'm going to tell you the differences between the different types of cloth diapers because it is very confusing for the newbie!  I think I have it all figured out now, hopefully this will help you if you are thinking about cloth diapering...

Flat Diapers:

-A Large square or rectangular piece of fabric

-Must be folded to fit

-Versatile

-Work for a large range of sizes

-Require a waterproof cover

Prefold Diapers:

-Pretty much a flat diaper that has been, you guessed it, "Prefolded" into smaller sections

-Made up of several layers.  For example: 4x8x4 -- 8 layers in the middle section with 4 layers on either side

-Inexpensive

-Effective and easy

-Need folded to fit

-Require a waterproof cover

Contour Diapers:

-Shaped like disposable diapers

-No elastic at waist or legs

-Require pins or snappi to fasten

-Require a waterproof cover

Fitted Diapers:

-Shaped like disposable diapers

-Have elastic at waist and legs

-Most fasten with Velcro or snaps

-Require a waterproof cover

Pocket Diapers:

-Have a pocket where an insert is placed for absorbency

-Are not effective without an insert

-Most have a waterproof cover built in

-Removable insert = faster drying time

All-in-one (AIO) Diapers:

-Works like a disposable diaper

-Fasten with snaps or velcro at the waist

-Built in waterproof cover

-No folding or inserts

All-in-two (AI2) Diapers:

-Works like an AIO

-Has a removable doubler to add absorbency

-Removable doubler cuts down on drying time

One Size (OS) Diapers:

-Designed to fit all sizes

-Probably won't fit premature babies

-Probably won't fit big toddlers

-More cost effective than sized diapers

-Can be bulky on small babies

I think I got everything!  If you have any questions or if I missed anything, please leave a comment!