Saturated compounds have only single carbon-carbon bonds, meaning that each carbon atom is bonded to the maximum number of atoms or groups. These compounds are typically alkanes, exhibiting a tetrahedral geometry around each carbon atom. In contrast, unsaturated compounds contain at least one carbon-carbon double or triple bond, resulting in fewer hydrogen atoms bonded to the carbon atoms. Unsaturated compounds include alkenes and alkynes, characterized by a planar or linear arrangement around the double or triple bond. The presence of multiple bonds introduces reactivity and geometrical isomerism, distinguishing unsaturated compounds from their saturated counterparts.