There are several types of bow ties, including pre-tied, self-tie, clip-on, and adjustable. Each type offers varying convenience and formality levels. Bow ties are commonly worn at formal events like weddings, black-tie affairs, and special ceremonies, but they can also be used to elevate casual attire or as a fashionable accessory for themed gatherings. Additionally, bow ties can indicate specific professional roles, such as waiters, professors, and scientists. In summary, bow ties fulfill both practical and aesthetic purposes across various contexts.