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The Spooler is a special process that manages access to printers by multiple users. For most users, the function of the Spooler is transparent. They generate a job for a printer and go to the printer to pick up the output.
To spool (which stands for "simultaneous peripheral operations online") a computer document or task list (or "job") is to read it in and store it, usually on a hard disk or larger storage medium so that it can be printed or otherwise processed at a more convenient time (for example, when a printer is finished printing ...
How does spooling work? When you send a job to a spooler, it creates a temporary file that holds the data to be processed. The spooler then manages the communication between your computer and the device, ensuring that multiple jobs can be queued and processed one after another.