SE and SET definition

SE (Social Engineering) trick conducted by a hacker/cracker to fool the victim to want to do something.
SET (Social Engineering Toolkit) is specifically designed to perform advanced attacks againts the human element. Originally this tool was designed to be released with the http://www.social-engineer.org launch and has quickly became a standard tool in a penetration tester arsenal. SET was written by David Kennedy and a with a lot of help from the community in incorporating attacks never before seen in an exploitation toolset. The attacks built into the toolkit are designed to be targeted an focused attacks againts a person or organization used during a penetration test.