What is the difference between a handgun and an 'assault weapon'?

What is the difference between a handgun and an 'assault weapon'?

Larry Pratt (Executive Director, Gun Owners of America) gives expert video advice on: What is an 'assault weapon'?; What is the difference between a handgun and an 'assault weapon'?; What is an assault rifle? and more...

Most assault weapons are machine guns which are usually rifles, very few handguns or machine guns.