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There are a number of different types of Isomerism. Essentially they are all to do with molecules which have features in common, but which also differ on some level. This may be the order in which the atoms are arranged, or the orientation of parts of the molecule in space.

More on Structural Isomers
More on Geometric Isomers
More on OpticalIsomers
A look at opticalIsomerism in Thalidomide