What is the difference between stainless steel and carbon steel?


Answer:
Stainless steel is less likely to rust or stain.  Stainless steel needs less maintenance and care. 
 Carbon steel needs to be cleaned and dried when you are done using it. It will also build a patina with use.  The patina will help protect the steel from rusting. 
 Why would someone want carbon steel?  Carbon steel is a more traditional steel, it is usually pretty tough, holds a good edge and is easy to resharpen.  It is also cheaper than stainless steel.

Modern stainless blade steels are very good, but come with a higher price.