Chirality is a specific type of stereoisomerism related to the spatial arrangement of atoms in molecules. A chiral molecule is one that cannot be superimposed on its mirror image, similar to how left and right hands are mirror images but not identical. This occurs when a molecule has a carbon atom with four different substituents, known as a chiral center. Compounds that have non-superimposable mirror images are called enantiomers. These enantiomers may exhibit different biological activities, which makes chirality an important aspect to consider in fields such as pharmaceutical chemistry.