In-ear monitors (IEMs) are small audio devices that fit snugly inside the ear canal. They are commonly used by musicians and audio professionals to hear a mix of sounds during live performances or studio recordings. IEMs provide a more personalized listening experience, allowing users to isolate sounds and reduce background noise. These devices come with various features, including different driver types and customizable sound profiles. Many IEMs are designed for comfort and durability, making them suitable for extended use. Popular brands include Shure, Sennheiser, and Westone, each offering a range of models to cater to different needs and preferences.