What is the main purpose of a card reader in an access control system?

The primary function of a card reader within an access control system is to authenticate an individual's identity. When a user presents their access card to the reader, the device scans the card and verifies the information encoded on it against a database of authorized users. This process ensures that only individuals with valid credentials are allowed access to secured areas or resources. The effectiveness of access control relies heavily on this authentication process to prevent unauthorized access.

Options that suggest initiating a power failure, monitoring camera feeds, or generating access reports, while potentially related to a broader security system, do not accurately describe the direct role of a card reader. Instead, these functions may be performed by other components of the security infrastructure, such as alarm systems, surveillance systems, or software for monitoring and reporting access logs. The card reader's essential role is focused solely on verifying identity to control access.