Pocket Diapers: Bumgenius, Fuzzibunz and Rumparooz are all well known for their pocket diapers. Many other companies make them, as do some WAHMs. A Pocket diaper consists of a waterproof outer of either Polyester Urethane Laminate (PUL), a printed outer with hidden PUL, or Fleece. They typically have a stay-dry inner made of microfleece, suedecloth or microsuede, though Blueberry and others make them with Bamboo or other natural fiber inners. The diaper has a pocket opening where you stuff an absorbent soaker. The openings are usually in the back, though some brands put the opening in the front (the benefit of the front pocket is not having to stick your hand in yuck to pull the insert out). Diapers close with snaps or Velcro and can be sized or one size via snap down rises.
All in Ones (AIOs): These are the most like a disposable diaper. They typically look very much like a pocket diaper and have a waterproof outer, usually a stay dry inner (Bumgenius has an organic all in one), Velcro or snap closures, and can be sized or one size. However, the soaker is sewn into the diaper. It can either be completely sewn into the diaper between the inner and outer layers, it can be sewn just at one end like the Kissaluvs Marvels, sewn to the inner like the Bumgenius AIO (you can turn it inside out for quicker drying) or even a snap in soaker like the Goodmama One (I found this so confusing, a fitted, AIO or AI2 can all have the same style soaker!)
Many all in ones also have a pocket to allow you to add additional soakers as needed.
You can also buy fleece soakers, which are cut similarly to a wool interlock soaker. They are usually sized and aren’t as stretchy as a wool cover.