Computers that have multiple CPUs within a single computer, sharing some or all of the system's memory and I/O facilities, are called, or sometimes tightly coupled systems.

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Multi processor

Explanation:

Multiprocessor is when two or more central processing units are used within a single computer system thereby making it easy to allocate or share tasks between them at the same period of time and enable several program to run repeatedly.

Multiprocessing system enable more work to be completed within a time frame due to the numbers of processors thereby saving cost.

Therefore Computers that have multiple CPUs within a single computer, sharing some or all of the system's memory and I/O facilities, are called MULTI PROCESSOR.