Access control is a security technique that regulates who or what can view or use resources in a computing environment. It is a fundamental concept in security that minimizes risk to the business or organization. The card reader on the door constantly emits a Radio Frequency energy Field. When a card crosses the field, the power from the field energizes a copper wire inside the card, which powers the chip containing the card number and any other unique data.
The purpose of access control is to provide fast, convenient access control for authorized users Individuals, at the same time, restrict access to unauthorized people.