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Good News: You Can Play Call of Duty For Free\n\n There are two ways that you can play Call of Duty for free, and they're both dramatically popular. Firstly, there's the Warzone ecosystem, which is made up of Call of Duty Warzone and Call of Duty Warzone 2.0.
An operating system (OS) is the program that, after being initially loaded into the computer by a boot program, manages all of the other application programs in a computer. The application programs make use of the operating system by making requests for services through a defined application program interface (API).