Basophils are a type of white blood cell that play a crucial role in the immune system. They are part of the body's defense mechanism against allergens and infections. Basophils contain granules filled with chemicals, such as histamine, which are released during allergic reactions and inflammation. These cells are produced in the bone marrow and circulate in the bloodstream. When they encounter allergens or pathogens, basophils can contribute to the inflammatory response, helping to protect the body. Their activity is important in conditions like asthma and hay fever, where allergens trigger an immune response.