An aromatic ring is a cyclic conjugated system with electronic stabilization associated with aromaticity. For a simple planar monocyclic pi system, the familiar criterion is pi electrons, together with continuous orbital overlap.
Benzene is the standard six-pi-electron example. A polygonal drawing alone does not establish aromaticity: geometry, conjugation, and electronic state matter. Aromatic stabilization helps explain why many such rings undergo substitution while preserving their conjugated framework.
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