December 2021 marked the final month of the year, characterized by winter in the Northern Hemisphere and summer in the Southern Hemisphere. Many countries celebrated various holidays, including Christmas and Hanukkah, which brought families together for festive gatherings and traditions. During this month, the world continued to navigate the challenges posed by the COVID-19 pandemic, with the emergence of the Omicron variant leading to increased cases in several regions. Vaccination efforts were ongoing, with many countries encouraging booster shots to enhance immunity against the virus.