A Priori and A Posteriori Knowledge

A priori knowledge is information understood independently of experience, like mathematical truths (e.g., 2 + 2 = 4). It’s known through reasoning alone. A posteriori knowledge, however, comes from experience or observation, like knowing the sky is blue because you see it. In foundationalism, a philosophical theory about knowledge, these types of knowledge help establish basic beliefs. A foundationalist would argue that a priori knowledge can provide a secure base for knowledge, while a posteriori knowledge builds on that foundation, illustrating how we understand and acquire knowledge about the world.