What is a data center, and what happens inside one?

A data center is a facility that houses the servers, storage systems, and networking equipment that run modern digital services. Everything from email and video streaming to banking, navigation, and cloud-based storage rely on data centers. Inside, servers sit in standardized 19-inch racks arranged in long rows, supported by cooling systems, backup generators, fire-suppression systems, and layered physical security.

Data centers range from small server rooms inside office buildings to hyperscale campuses spanning thousands of square feet. They are commonly grouped into three categories: enterprise facilities used by a single company, colocation facilities that lease space to many tenants, and hyperscale campuses operated by large cloud providers such as Amazon, Google, Microsoft, and Meta.

Without this modern digital infrastructure, most technologies we use daily like iPhones couldn’t function.