The main objective of a mantrap is to prevent piggybacking, which refers to unauthorized individuals following closely behind an authorized person to gain entry to a restricted area without proper authentication. By allowing only one person at a time, the mantrap ensures that each individual must present their credentials, such as an access card or biometric identification, before proceeding further into the secure area.
Your description isn't entirely correct, you're describing tailgating. Piggybacking is similar except its generally an unauthorized person allowing someone in, assuming they're supposed to be there. i.e. its the difference between scurrying in while the doors open (tailgating) and having a staff member hold the door open because you're carrying a large box of donuts (piggybacking)
piggybacking, similar to tailgating, refers to when a person tags along with another person who is authorized to gain entry into a restricted area, or pass a certain checkpoint.
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