Video from The Thomistic Institute
"Straddling between two extremes, St. Thomas Aquinas follows Aristotle in proposing a theory of moderate realism. Against Plato, St. Thomas insists that the universals are first in things themselves. Against William of Ockham, he insists that real connections exist among generically similar things, and that we can actually know and name them. Moderate Realism (Aquinas 101) - Fr. Gregory Pine, O.P." from video introduction.