Dichloroethenes are a group of chemical compounds that contain two chlorine atoms and a double bond between two carbon atoms. They are primarily used in industrial applications, such as solvents for cleaning and degreasing, and in the production of other chemicals. The most common forms are cis-dichloroethene and trans-dichloroethene, which differ in the arrangement of their atoms. These compounds can be harmful to human health and the environment. Exposure may occur through inhalation, skin contact, or contaminated water. Due to their potential risks, dichloroethenes are regulated in many countries to minimize their impact on public health and ecosystems.