MongoDB is used by Santa Claus for managing presents and data across different time zones, allowing him to efficiently deliver presents while reducing his carbon footprint. Santa uses MongoDB's flexible data structure to make changes without migrating data, and its aggregation framework to perform real-time analytics on present delivery. He also leverages MongoDB's geo distribution capabilities to distribute data across multiple data centers, ensuring that parents in different time zones can approve their children's requests quickly. Additionally, Santa utilizes MongoDB's sharding feature to partition data and distribute load across data centers, allowing him to efficiently access data from anywhere in the world. With its various features, MongoDB enables Santa to manage his presents and data effectively while keeping costs low and infrastructure spend under control.