Which component is essential for verifying user identities in an access control system?

In an access control system, card readers are essential for verifying user identities because they provide a means for users to authenticate themselves before gaining access to secure areas. By requiring users to present an access card or key fob, card readers capture unique identifiers that are cross-checked against a database of authorized users. This process ensures that only individuals with valid credentials are allowed entry, thereby enhancing the security of the facility.

While access control panels facilitate the management and processing of the data collected from card readers, they do not directly verify user identities on their own. Security cameras serve a different function by monitoring and recording activity, allowing for surveillance and investigation after incidents. Alarm systems are primarily designed to alert personnel to unauthorized entry or breaches rather than to verify who is attempting access. Therefore, card readers play a critical role in the direct verification of user identities in an access control system.