Answer Description
Shoulder surfing is a common tactic to gain information by standing near a person as they talk on the phone, fill out a form, or type in their password.
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 shoulder. This 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 …
Shoulder surfing (computer security) - Wikipedia, the free encyclopedia