Iris scan is a biometric recognition technology, which has high accuracy and a non-forging nature. This review paper provides an overview of the workings of iris scanning technology and a few models which is used for the recognition systems. The system of Iris recognition depends on the patterns found in the iris part of the eye to recognize people and verify them. Iris recognition is a valuable tool for security, access control, verification, and authentication. Also, the iris scanning technology can be used in applications in healthcare, and border control, to increase security. Iris has features like unique patterns and longterm stability throughout the lifespan of a person, making it more secure and reliable than other recognition biometrics like fingerprint and face recognition. Integration of AI and Hybrid models (Use of traditional models like Daugman’s rubber sheet model with deep learning) is also making it more secure and faster as technology is evolving.