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The difference is in the shape, as can be guessed by the name.
I think the least common is elliptical or irregular..
galaxie 1, 2, 3, 4 and 5
An irregular galaxy is a galaxy that doesn't have a specific shape like a pinwheel or an elliptical galaxy.
Spiral Galaxy. Your Welcome =)
Generally, an elliptical galaxy is the oldest, a spiral galaxy is mid life and an irregular is fairy new. However, this is generally. An irregular galaxy can be formed from the merge of two elliptical galaxies - so it's not fool proof.
there are 3 types of galaxies. 1.spiral 2.elliptical 3.irregular the main galaxy in our universe would be a spiral galaxy
A dwarf galaxy by virtue of it's name will be smaller than a "normal" galaxy.
B.) A giant elliptical galaxy
An Irregular Galaxy is a galaxy that has no shape or form as defined by the classes of the "Hubble sequence" An Amorphous galaxy is a galaxy that has neither spiral nor elliptical in shape as defined by "The Atlas of Peculiar Galaxies". See related links for pictorial representation