Regioselectivity is a concept in organic chemistry that refers to the preference of one or more reactive sites in a molecule for chemical reactions. It involves the selective reaction of a functional group at a particular position on a molecule, rather than at another potential position. Regioselectivity is important in determining the outcome and efficiency of various chemical reactions, as different regioselectivities can lead to different products with varying properties and applications. Researchers may study regioselectivity in order to optimize reaction conditions, design new synthesis routes, or understand the mechanism of a reaction. This area of research is relevant in fields such as drug discovery, materials science, and natural product synthesis.