why benzene is aromatic
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Aromaticity is a electronic property of a molecule, not a description of its shape. An aromatic molecule contains a circular system of conjugated π bonds and p orbitals that contains 4n+2 electrons, where n is an integer.
Benzene is aromatic: it has 6 electrons in a circular conjugated system (4n+2=6, n=1).
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Benzene is an aromatic hydrocarbon because it obeys Hückel's rule. Originally, benzene was considered aromatic because of its smell: it has an "aromatic" odor. It is now considered aromatic because it obeys Hückel's rule: 4n+2 = number of π electrons in the hydrocarbon, where n must be an integer
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