Cyclic compounds are molecules that have a ring-like structure, meaning their atoms are connected in a loop. These compounds can be made up of carbon atoms, like in cyclohexane, or can include other elements such as oxygen or nitrogen. The ring structure can affect the compound's properties, making them unique compared to their linear counterparts. There are different types of cyclic compounds, including aromatic compounds, which have special stability due to their electron arrangement. Cyclic compounds are important in many areas of chemistry and biology, as they are found in natural substances like DNA and various pharmaceuticals.