Trichomonas, commonly referred to as trichomoniasis, is a sexually transmitted infection caused by the parasite Trichomonas vaginalis. It primarily affects the urogenital tract, leading to symptoms such as itching, burning, and unusual discharge in women, while men often show no symptoms. The infection is treatable with antibiotics, but if left untreated, it can lead to complications such as increased susceptibility to other sexually transmitted infections. Regular screening and safe sex practices can help prevent its spread.