What is the difference between an SDS and MSDS?

Generally, the term MSDS refers to regulations that were put in place prior to the implementation of the GHS. For example in the United States the term MSDS typically refers to the data sheet that is required under OSHA's HazCom 1994 standard, while in OSHA`s Hazcom 2012 the term 'material' has been dropped, and the data sheets are referred to simply as Safety Data Sheets. In Canada data sheets are still called MSDS, as the GHS has not been implemented yet. And in Europe they have been called SDS even before implementing the CLP, which aligns previous EU legislation with the GHS.