The gyroscopes are defined as devices, which can measure, autonomously, rotational motions relative to inertial space. They are of central importance for flight control, for navigation/orientation in the air, at sea and on land, and also for stabilization/guidance of smart weapon systems. Benefitting form advances in semiconductor technology, the basis of gyro systems has changed from mechanical platforms to strapdown technology. For strapdown use, new types of gyroscopes, such as optical gyros, have been developed. This paper presents optical gyros, emphasizing the fiber gyro and its principal advantages such as solid-state operation, light weight, small size, low power consumption, rapid turn- on time and high reliability, that are important considerations for many high-performance application areas.