A Porro Prism is an optical device used in binoculars and other optical instruments to invert and revert images. It consists of two prisms arranged in a specific way, allowing light to enter and exit at right angles. This design helps to create a more compact and efficient optical path, resulting in a clearer and brighter image. The Porro Prism is named after the Italian optician Ignazio Porro, who developed this design in the 19th century. It is commonly found in various types of binoculars, providing a wider field of view and better depth perception compared to other prism types, such as the Roof Prism.