World Quantum Day is observed worldwide every year on April 14, aiming to enhance public understanding of quantum science and technology. Launched by quantum scientists in 2021, the day was first celebrated on April 14, 2022, with the date chosen to reference the rounded first three digits of the Planck constant. This constant is a fundamental aspect of quantum mechanics, linking energy to frequency, and plays a significant role in defining the kilogram, a base unit of mass. Events on this day include open lectures, outreach talks, debates, lab tours, and interviews, organized by a diverse range of participants, including scientists, educators, and institutions like CERN. Participants can also engage in virtual events or create their own activities, often sharing their experiences on social media using the hashtag #WorldQuantumDay.