What is the Great Sphinx about

Some believe that it was built by Khafre's older brother Redjedef (Djedefre) to commemorate their father, Khufu, whose pyramid at Giza is known as the Great Pyramid. These theorists claim that the face of the Great Sphinx bears more resemblance to Khufu than Khafre, and that observation also led to speculation that Khufu himself built the statue.