An iris scanner is a biometric device that identifies individuals by analyzing the unique patterns in their iris, the colored part of the eye. This technology uses a camera to capture a detailed image of the iris, which is then compared to stored templates in a database for verification. Iris scanning is known for its high accuracy and speed. Iris scanners are commonly used in security systems, such as in airports and government buildings, to control access. They are also found in some smartphones and laptops, providing a convenient way to unlock devices while ensuring user privacy and security.