What type of bond is formed between carbon atoms in an alkene?

In an alkene, the carbon atoms are connected by a double bond. This type of bond consists of one sigma bond and one pi bond, which allows for the characteristic structure and reactivity of alkenes. The presence of a double bond is what differentiates alkenes from alkanes, which contain only single bonds between carbon atoms. The double bond in alkenes not only affects their physical and chemical properties, such as their reactivity and the shape of the molecules, but it also introduces a level of unsaturation that is crucial in organic chemistry. Therefore, recognizing that alkenes specifically feature double bonds between carbon atoms is key to understanding their behavior and classification in organic compounds.