While tailgating and piggybacking are often used interchangeably, there is a subtle difference between the two. Tailgating generally refers to an unauthorized person following an authorized individual through a secure entry point without the authorized person's knowledge. Piggybacking, on the other hand, involves the authorized individual knowingly or unknowingly assisting the unauthorized person by holding the door open or allowing them to enter without proper credentials. Both methods exploit human behavior and social norms but differ in the level of awareness and participation of the authorized person.