A diaphragm is a thin, flexible barrier used in various applications, most commonly in medicine and contraception. In the context of birth control, a diaphragm is a dome-shaped device made of silicone or latex that is inserted into the vagina to cover the cervix. It prevents sperm from entering the uterus, thus reducing the chance of pregnancy. In addition to its use in contraception, diaphragms are also found in mechanical devices, such as microphones and speakers. In these cases, a diaphragm vibrates in response to sound waves, converting acoustic energy into electrical signals or vice versa. This principle is essential for producing sound in many audio devices.