12-04-2015 08:03 AM
Read the manual on these for a full explanation. SAS/Graph is the technology used in older SAS versions to produce graphics. The enhanced procedures, for example SGPLOT, are linked in the with underlying Graph Template Language which SAS 9/x and going forward will use. What SGPLOT for instance does is create template code behind the scenes. Its very flexible.
For examples of Grphas and what GTL/Sgplot can do, just pop over to this excellent blog: