A Print Spooler is a software program that manages print jobs sent from a computer to a printer. It temporarily stores these jobs in a queue, allowing the printer to process them one at a time. This ensures that multiple print requests can be handled efficiently without overwhelming the printer. When a user sends a document to print, the Print Spooler takes over, organizing the tasks and sending them to the printer in the correct order. This allows users to continue working on their computers while their documents are being printed, improving overall productivity.