The Black Death, a devastating pandemic in the 14th century, killed millions across Europe, Asia, and Africa. Caused by the bacterium Yersinia pestis, it spread through infected fleas on rats, decimating populations and reshaping society. This catastrophic event had far-reaching consequences, altering power structures, economic systems, and cultural norms. It led to labor shortages, increased wages, and social mobility, while also sparking religious questioning and artistic movements that would influence European history for centuries.