STIs, or sexually transmitted infections, are infections that are spread through sexual contact. This includes infections such as chlamydia, gonorrhea, syphilis, herpes, and HIV. STIs can have serious consequences for individual health, including infertility, chronic pain, and even death. Prevention and treatment of STIs are important public health priorities, and researchers study various aspects of STIs including their transmission, prevention strategies, and treatment options to help reduce the spread of infections.