RoHS certifications refer to compliance with the Restriction of Hazardous Substances (RoHS) Directive, a regulation originally established by the European Union to reduce environmental impact and protect human health by restricting harmful substances in manufacturing processes. RoHS aims to limit the use of specific hazardous materials in electrical and electronic equipment (EEE). Products that meet these requirements are considered RoHS-compliant and can be sold within the EU and other markets that adopt similar regulations. While RoHS compliance is often required for CE marking, the two certifications address different aspects of product safety and performance. You can learn more about CE certification here