Colocation (or co-location) is the act of placing multiple (sometimes related) entities within a single location.
- In an organization, it refers to placing related roles or groups in a single room, building or campus.
- In business, it refers to the practice of locating multiple similar businesses in the same facility.
- In trading, it often refers to placing multiple data centers in proximity to trading centers 
- In telecommunications, primarily wireless telecommunications facilities such as mobile wireless (cell sites) and radio broadcasting, it refers to the practice of locating multiple wireless broadcast facilities/providers within the same facility. Many jurisdictions now mandate colocation of mobile wireless carriers within a single facility to avoid the proliferation of wireless communication towers.
- In the fast food restaurant industry, one primary use of this concept is Yum! Brands with its KFC, Taco Bell, A&W Restaurants, Long John Silver's and Pizza Hut menus appearing in the same restaurant.
- In the retail sector, Sears Holdings often operates its large format Sears stores with an income tax services office, an optical shop, and other independent operations.
- In the airline industry, colocation commonly occurs at airports. Airline alliances will be assigned or build a fortress out of certain terminals or dominant carrier-specific terminals. An example would be at Tokyo's Narita Airport, where local carrier All Nippon Airways, a member of the Star Alliance, and its partners operate in one terminal to facilitate partner connections and product offerings, even offering combined check-in, member lounges, and ground services.
Colocation is often used in the data sourcing industry to mean off-site data storage, usually in a data center. This is very important for businesses since the loss of data can be crucial for companies of any size, up to and including disciplinary action for employees or loss of their job. An unexpected loss in data can result from fires, earthquakes, floods, or any sort of natural disaster.
Data colocation technology began to take hold in the telecommunications industry. Colocation enables multiple customers to access network, server, and data storage space, connecting them to a variety of service providers.
- High-Frequency Trading Shops Play the Colocation Game, Advanced Trading, Ivy Schmerken.
- Fear of Data Loss, Social Media Security Risks Rising, CIO Magazine, Joan Goodchild, 20 September 2010.
- Colocation: The Logical Home for the Cloud, Computerworld, Cyrus One.
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