Final answer:
Keycard readers and keypads are security devices used to control access to secure areas by requiring a keycard or PIN but do not log exits, prevent tailgating or determine intent.
Step-by-step explanation:
Keycard readers and keypads are electronic devices used in security systems to control and restrict access to a secured area. These systems often require a physical keycard or a numeric code that is entered on the keypad to grant entry. Keycards can come in various forms, such as magnetic stripe cards, RFID cards, or smart cards. Keypads, on the other hand, usually require a personal identification number (PIN) to be entered. These devices offer a level of security but are not infallible; they do not provide a record of exit, nor do they typically prevent tailgating, where an unauthorized person follows someone with authorized access. They also do not determine the intent of an individual entering a space or safeguard against lost, stolen, or duplicated keycards.