Spooling is the temporary storage of data so that it can be used and processed by a device, software, or system. Data is supplied to and stored in MEMORY or other volatile storage until it is required by a programme or computer for execution. SPOOL is an abbreviation for "Simultaneous Peripheral Operations Online." The spool is typically stored in physical memory, buffers, or interrupts for Input/Output devices on the computer. To process the spool in ascending order, the FIFO (first in, first out) approach is employed. Spooling is the process of gathering data from a large number of Input/Output processes and STORING it in a buffer. This buffer is a memory or hard disc area that Input/Output devices can access. In a distributed context, an operating system does the following:

• Controls data spooling for Input/Output devices with varying data access rates.
• Maintains the spooling buffer, which acts as a data holding space while the slower device catches up.
• The spooling procedure preserves parallel computing since a computer can perform Input/Output in parallel sequence. The computer can now read data from a tape, write data to disc, and print data to a tape printer all at the same time.

Printing is the most visible application of spooling. Before being added to the printing queue, the PAPERS to be printed are held in the SPOOL. Several programmes can run and use the CPU during this period without having to wait for the printer to FINISH printing on each paper individually. Many additional features, such as defining priorities, receiving notifications when the printing process is complete, and selecting different types of paper to print on based on the user's preferences, can be added to the Spooling printing process.

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