Chlamydia is a common sexually transmitted infection caused by the bacterium *Chlamydia trachomatis*. It often presents with mild or no symptoms, but if left untreated, it can lead to serious health issues like infertility and pelvic inflammatory disease. Treatment typically involves a course of antibiotics, such as azithromycin or doxycycline, which effectively eliminate the infection. It’s important for sexual partners to be tested and treated simultaneously to prevent reinfection. Regular screening and practicing safe sex can help prevent chlamydia and its complications.