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Edwin Hubble invented a classification of galaxies and grouped them into three classes: spirals, ellipticals and irregulars. He classified these galaxies further according to the size of their central bulge and the texture of their arms.

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Elliptical galaxies have a smooth spherical appearance. They have far less structure than spiral galaxies do. Elliptical galaxies are typically found in galaxy clusters.

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A spiral galaxy has a rotating disc with spiral  arms that curve out from its dense central region. For example the Milky Way is a spiral galaxy

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Irregular galaxies have no particular shape. They are the smallest galaxies and are full of gas and dust. Having a lot of gas and dust means that these galaxies have a lot of star formation going on within them.

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Elliptical - Messier 87

Spiral - Andromeda

Irregular - Messier 82