Modern dentistry is changing at a rapid pace, with CAD/CAM playing a significant role as a diagnostic and treatment planning tool and a means to fabricate various dental prosthetics. Harnessing state-of-the-art 3D imaging technologies, Intraoral Scanners accurately capture the shapes and contours of teeth as well as hard and soft tissue of oral cavity. This advanced technology enables dentists to attain superior scanning results, offering clearer insights into patients' dental structures and ensuring precise and customized treatment. In turn, with the upsurge in available options, it has become increasingly challenging for dental professionals to make investment decisions regarding which scanner to purchase. Using insights gained from the use of many different scanner systems, this literature reviews intraoral scanner technology and discusses various scanners in the market today along with their advantages and disadvantages of using optical impressions compared to conventional impressions and also evaluate the differences between the IOS currently available commercially and determine the current clinical applications/limitations in the use of IOS.