This document discusses the legal definition and elements of the crime of robbery according to Section 390 of the Penal Code. Robbery is defined as aggravated theft or extortion involving violence, attempted violence, or threats of violence. For robbery by theft, the prosecution must prove that the defendant stole property, intended to take it without consent, did so dishonestly, and used or threatened violence to commit the theft. For robbery by extortion, the prosecution must prove that the defendant put the victim in fear and induced them to hand over property through dishonest means while in their presence. The violence or threat of violence must be causally linked to the commission of the theft or extortion.