World AIDS Vaccine Day, also known as HIV Vaccine Awareness Day, is observed worldwide every May 18. The observance was established on May 18, 1997, following a commencement speech by then-President Bill Clinton at Morgan State University, where he urged the global community to develop an AIDS vaccine. The first observance took place on May 18, 1998, to commemorate this challenge. The day serves to highlight the urgent need for a vaccine to prevent the spread of HIV and AIDS, drawing attention to the ongoing efforts of thousands of scientists, health professionals, and volunteers working towards this goal. Despite their efforts, progress is hindered by a lack of new technologies, emphasizing the importance of investment in their development. The observance continues to remind people of the significance of HIV/AIDS preventive measures.