Rotational isomers, also known as conformers, are different forms of a molecule that arise from the rotation around a single bond. This rotation can lead to variations in the spatial arrangement of atoms, resulting in distinct three-dimensional shapes. These isomers can have different physical and chemical properties, even though they share the same molecular formula. The concept of rotational isomers is important in organic chemistry, particularly in the study of alkanes and cycloalkanes. Understanding these isomers helps chemists predict the behavior of molecules in reactions and their interactions with other substances, which is crucial in fields like pharmaceuticals and materials science.