Hückel's Rule is a principle in organic chemistry that helps identify whether a cyclic compound is aromatic. According to this rule, a molecule is considered aromatic if it is cyclic, planar, and has a specific number of π (pi) electrons. The number of π electrons must equal 4n + 2, where n is a non-negative integer (0, 1, 2, ...). This means that acceptable values for n yield 2, 6, 10, etc., π electrons. Aromatic compounds, such as benzene, exhibit unique stability and reactivity due to their delocalized π electrons. This delocalization allows for resonance, which contributes to the compound's overall stability. Understanding Hückel's Rule is essential for predicting the behavior of various organic molecules in chemical reactions.