To store data that is send to a device, such as a printer, in a buffer that the device reads.

This procedure allows the program that sent the data to the device to resume its normal operation without waiting for the device to process the data.

Spool is a temporary storage area within the computer RAM that contains INPUT or OUTPUT data.

When a process or job is initiated on a computer but cannot be run immediately, it is often placed in a spool.

This process is called spooling.

The spool holds the data until the appropriate device is ready to use it.

SPOOL is an acronym for simultaneous peripheral operation on-line.

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