Chlamydia is a common sexually transmitted infection (STI) caused by the bacterium Chlamydia trachomatis. It often affects the genital area, but can also infect the throat and rectum. Many people with chlamydia do not experience symptoms, which can lead to undiagnosed cases and potential complications if left untreated. Testing for chlamydia is simple and can be done through urine samples or swabs. If diagnosed, it is typically treated with antibiotics. Regular screening is recommended for sexually active individuals, especially those under 25, to help prevent the spread of this infection and protect overall reproductive health.