Gonorrhea is a sexually transmitted infection (STI) caused by the bacterium Neisseria gonorrhoeae. It primarily affects the mucous membranes of the genital tract, but can also infect the throat and rectum. Symptoms may include painful urination, discharge, and in some cases, it can lead to serious complications if left untreated. Gonorrhea is typically treated with antibiotics, but antibiotic resistance is a growing concern.