A Porro prism is an optical device used to invert and revert images, commonly found in binoculars and other optical instruments. It consists of two prisms arranged in a specific way, allowing light to enter and exit at right angles, which helps in achieving a compact design while maintaining a correct orientation of the viewed image. The design of the Porro prism enhances depth perception and field of view, making it popular for outdoor activities like birdwatching and hiking. Its unique shape allows for a wider separation of the eyepieces, contributing to a more immersive viewing experience compared to other prism types, such as the roof prism.