IgE, or Immunoglobulin E, is a type of antibody produced by the immune system. It plays a crucial role in the body's response to allergens, such as pollen, pet dander, and certain foods. When an allergen enters the body, IgE binds to it, triggering the release of chemicals like histamine, which can lead to allergic reactions. Elevated levels of IgE are often associated with allergic conditions, including asthma, hay fever, and eczema. Testing for IgE levels can help diagnose these allergies and guide treatment options. Understanding IgE is essential for managing allergic responses effectively.