Wikipedia
In computer security, shoulder surfing is a type of social engineering technique used to obtain information such as personal identification numbers (PINs), passwords and other confidential data by looking over the victim's shoulderThis attack can be performed either at close range (by directly looking over the victim's shoulder) or from a longer range, for example by using a pair of binoculars or similar hardware To implement this technique attackers do not require any technical skills keen observation of victims' surroundings and the typing pattern is sufficient Crowded places are the more likely areas for an attacker to shoulder surf the victim
Shoulder surfing (computer security) - Wikipedia, the free encyclopedia