Print requests are submitted to a print queue. The request is transmitted to the appropriate system and stored there until it can be printed. This usually happens immediately, but may be longer if there are previous requests that have not finished printing yet.
Finally, the request is printed on a print device such as a laser printer or inkjet plotter. On the more popular print devices a header page will with the information identifying the print requests origin will also be printed so that you can easily find your own printout.
More than one print device may be associated with a single print queue. This speeds up printing because print requests will be printed on the first available device.