Final answer:
Plato believed in a more real and perfect realm inhabited by the forms or essences of things, which he called the realm of ideas.
Step-by-step explanation:
According to Plato, the world we live in is a mere representation of a perfect world, which he calls the realm of ideas. Plato believed that the realm of ideas is the ultimate reality and the seat of all truth, beauty, justice, and wisdom. This realm is inhabited by the perfect forms or essences of things, such as the form of a human being, which is perfect and eternal compared to our physical bodies that decay and are imperfect.