Everyone has his or her tool of the trade. You know, your favorite work-related technology or device that's essential to your job. Mine is the computer. As a digital web editor, I can't live without it and I can't work without it.

For a mechanic, the wrench or the car jack might be his essential tool. For a teacher, teaching without the black board, a piece of chalk or books might be hard, and the doctor won't be able to diagnose correctly without machines such as the CT scanner or the MIR machine. How about you? What is your favorite tool of the trade and why?

Learn about other tools of the trade that are favorite tools among our editors. Read our article "Tools of the Trade."