RoHS stands for "Restriction of Hazardous Substances" and is an EU directive on the restriction of hazardous substances in electronic devices. It sets limits for substances such as lead, mercury and cadmium that are considered harmful to the environment and health. The aim of RoHS is to reduce the environmental impact during the manufacture, use and disposal of electronic equipment. Manufacturers must ensure that their products comply with the guidelines to protect the environment and ensure consumer health. RoHS affects a wide range of products, including electronics and their components.
The directive can also be found at EUR-Lex - 32011L0065 - EN - EUR-Lex (europa.eu)