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 Funciones del sistema operativo:

Booting: is a startup sequence that starts the operating system of a computer when it is turned on. 

User Interface:
refers to the part of an operating system, program, or device that allows a user to enter and receive information.

Memory management: is the function responsible for managing the computer's primary memory.

Multitasking: is one that can work on more than one task at a time by switching between the tasks very rapidly.

Storage devices management:  refers to the software and processes that improve the performance of data storage resources.

Security: refers to providing a protection system to computer system resources such as CPU, memory, disk, software programs...