My diaper adventures have me doing some educating newbies into the in's and outs of different types of diapers and diaper care lately. I thought I would share a couple of basic things so that it's here to refer back to in the future.
The above picture is an AIO (All-in-One). It has a cute outter fabric, a hidden inner waterproof layer, a sewn in hidden soaker, and an inner soft fabric against baby for comfort and to absorb moisture away.Below is the inside of the AIO. It works much like a disposable and is the simplest to use. It goes on and off like a disposable. The only down side to this type, I think, is that it takes a bit longer to dry, and makes for a pretty bulky bottom.
Below is a cover that you would use with prefolds, or fitted diapers that have no waterproof layer. This one happens to be adjustable. They can also come in different sizes.
One a side note: this link will take you to my explanation about using the microfit.
And this link will take you to a picture show of how to work your pocket diaper.