Mosquito repellents are substances designed to keep mosquitoes away from people and animals. They work by masking the scents that attract mosquitoes or by emitting odors that are unpleasant to them. Common active ingredients in these products include DEET, Picaridin, and oil of lemon eucalyptus. Repellents come in various forms, such as sprays, lotions, and wipes. They are often applied to exposed skin or clothing to provide protection during outdoor activities. Using mosquito repellents can help reduce the risk of mosquito-borne diseases, such as West Nile virus and Zika virus.