An employee walks down a hallway with rooms containing servers for different companies at a Digital Realty data center in Ashburn, Virginia on November 12, 2025. Data centers are the physical infrastructure that make our digital lives possible, yet most people have never seen one up close or understand how they operate. Roughly 12,000 data centers are in operation in the world, with about half in the US, according to Cloudscene, a data center directory. (Photo by ANDREW CABALLERO-REYNOLDS / AFP via Getty Images)