Insect repellent is a product designed to deter insects like mosquitoes, ticks, and flies from biting or landing on the skin. It typically contains active ingredients such as DEET, picaridin, or oil of lemon eucalyptus, which create a barrier that insects find unpleasant. Applying insect repellent to exposed skin or clothing helps reduce the risk of insect-borne diseases such as malaria, Zika virus, or Lyme disease. Regular reapplication according to product instructions is essential for effective protection against insects.