Sexually Transmitted Diseases (STDs) are infections that are primarily spread through sexual contact. They can be caused by bacteria, viruses, or parasites and may affect anyone who is sexually active. Common STDs include chlamydia, gonorrhea, syphilis, and HIV. Many STDs can be asymptomatic, meaning individuals may not show symptoms but can still transmit the infection to others. Prevention of STDs is crucial and can be achieved through practices such as using condoms, having regular health check-ups, and maintaining open communication with sexual partners. Early detection and treatment are important to prevent complications and reduce the risk of transmission.