Robbery is the act of taking the property of another through the use of force or the threat of violence.  The property must either be in the direct possession of the victim, or generally in his or her control at the time of taking.  Likewise, the taking must involve violence or intimidation to the owner- shoplifting, fraud, and other deceptive methods of stealing do not count as robbery.

 

Armed robbery is an aggravated crime, where a person commits robbery with a dangerous weapon.  The perpetrator does not have to use the weapon to be guilty of armed robbery.  It is not even necessary to display the weapon to the victim- the mere possession of a dangerous weapon at the time of the robbery is enough to be convicted of the aggravated offense.