This style of bob can be very short (right at the ear) or longer, under the chin. The style can give the appearance that the woman has no bang, but the bangs are there, just very long. They are usually swept to the side. There might be some light layering, or there might not be any layering at all, though the hair is usually straight (as with the classic).
This style of bob is extremely popular right now. This is best suited for women who have naturally straight hair or are willing to blow dry their hair straight. This style features hair that's mostly all one length. Often the front of the hair is cut longer than the back, but there are no bangs and if any layering, it's long layers.
This style is characterized by a side part and hair that's blown or lightly curled just barely under a bit. This isn't the bob that features hair that flips out (that style is quickly going out of style) but rather gently curls under. And when we say "gentle" we mean it's quite subtle. Many women can get their hair to do this naturally if they have the right cut.