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DATA CENTER 101

What they are.
How they work.
What they provide.

White technical sketch of a modern data hall with dense rows of server racks

A data center is a secure facility that houses computing, storage, and network equipment. It keeps the digital services people and organizations use available, connected, and protected.

SECTION 1

Types of data centers and their purpose

Different facilities serve different customers and distances. Their purpose determines their size, location, equipment, and operating model.

01

Enterprise

Built for one organization to run its own business systems, records, communications, and internal applications.

Typical MW size
About 1–20 MW
Primary need or use
Dedicated control of corporate systems, security, records, and business continuity.
02

Colocation

Shared facilities where multiple customers lease secure space, power, cooling, and network connections.

Typical MW size
About 10–100+ MW per facility
Primary need or use
Flexible capacity and carrier-rich connectivity without each customer building its own facility.
03

Hyperscale

Large facilities and campuses designed to operate cloud platforms and digital services for millions of users at high scale.

Typical MW size
About 50–300+ MW; campuses may be larger
Primary need or use
Massive, repeatable computing and storage capacity for global cloud and internet platforms.
04

Edge

Smaller facilities placed closer to users so time-sensitive services can respond with less delay.

Typical MW size
Below 1 MW to about 5 MW
Primary need or use
Low-latency processing, local connectivity, content delivery, and resilient regional services.

Planning note: MW ranges describe approximate electrical demand, not a universal classification. Actual facilities may fall outside these ranges based on design, density, customer mix, and campus phasing.

SECTION 2

How a data center works

Power enters the facility, protected electrical systems keep equipment operating, servers process and store information, cooling removes heat, and networks deliver services to users.

Utility substation and transmission lines supplying a landscaped data center campus
Electric gridPower arrives through a utility substation. Agreements, meters, and tariffs determine capacity and cost, so the facility pays for the electricity it uses.
Modern switchgear, UPS equipment, busway, and battery systems inside a data center
Power systemsSwitchgear distributes electricity while UPS batteries bridge brief interruptions. Emergency generators provide backup when normal utility service is unavailable.
Organized rows of server racks and fiber pathways inside a data center
ServersRacks of servers process requests and store information. Network switches connect the equipment so applications can respond securely and continuously.
Closed-loop data center cooling system with pumps, heat exchangers, piping, and dry coolers
CoolingFans, heat exchangers, and closed-loop air or liquid systems remove server heat. In this guide, closed-loop means sealed recirculation with non-evaporative heat rejection; hybrid or evaporative systems are identified separately.
Data center network connections reaching homes, a hospital, school, businesses, and emergency services
Digital servicesMultiple fiber routes carry information between the facility and users. That connectivity supports healthcare, schools, public safety, businesses, and homes.
Emergency generators, UPS batteries, and electrical equipment supporting data center backup power
Backup powerGenerators and batteries support continuity when normal utility service is interrupted.
Layered data center physical security with controlled entry, barriers, and surveillance
Physical securityLayered access controls protect people, equipment, and customer systems.
Organized fiber routes, network switches, and patch panels connecting a data center
Network connectionsMultiple fiber routes carry information between the facility, other data centers, and users.
SECTION 3

Services data centers provide today

Many ordinary services depend on data centers even when the facility is invisible to the person using them.

Emergency services

911 systems, dispatch records, alerts, and public-safety communications.

Communications

Email, messaging, video calls, mobile applications, and social platforms.

Banking and payments

Account access, card processing, payroll, transfers, and fraud monitoring.

Healthcare

Patient records, telehealth, imaging, prescriptions, and hospital systems.

Education

Student portals, online learning, research, libraries, and parent applications.

Media and entertainment

Streaming video, music, gaming, news, and digital publishing.

Business services

Websites, collaboration tools, accounting, customer records, and file storage.

Public services

Government records, benefit systems, tax services, permits, and civic websites.

Transportation

Navigation, traffic systems, airline operations, shipping, and fleet tracking.

Commerce

Online shopping, inventory, reservations, order processing, and delivery updates.