What is a kitchen rag?
A kitchen rag is typically a white, rectangular towel that has various duties in a professional kitchen.  Some of the uses include: wiping-down counter tops, sopping-up spills, securing cutting boards (use DAMP rags), and grabbing hot pans (use DRY rags).

Generally, it is a good idea to wash your hands with soap and a sink.  Often kitchen rags are used to clean debris from the hands between preparing food items.

Usually the rags are dropped-off, picked-up, and washed by an outsourced service provider (e.g. Cintas).  The kitchen rags from these providers often have a thin, colored line that runs lengthwise down the towel.

If you would like to find some for your home, try searching 'bar mops'.  They are essentially the same as kitchen rags, and are usually very cheap.