Is ProRes an I-frame codec or a GOP codec?

ProRes is primarily an I-frame codec, meaning it encodes each frame as a complete image rather than relying on inter-frame compression like GOP (Group of Pictures) codecs. This results in higher image quality and easier editing, as each frame can be accessed independently. However, ProRes can also include some forms of GOP structure in specific variations, such as ProRes LT, but it is predominantly used as an intra-frame format.