Gracillariidae is a family of moths commonly known as leaf miners due to their feeding behavior. There are many synonyms for this word, including Gracillarioidea, Gracillariinae, Gracilariidae, and Gracillariina, among others. Gracillariids are widespread, with species found on all continents except Antarctica. Their larvae are diverse in appearance, but all typically feed within the tissue of leaves, causing distinctive, often zigzag-shaped mines or blisters on the surface. Some members of this family also play important roles in biological control, as their larvae are used to monitor and control invasive plant species. Overall, the Gracillariidae family is an intriguing group of insects with fascinating life histories and ecological roles.