A priori concepts

A priori concepts are ideas or knowledge that we understand independently of experience or specific observations. They are based on reasoning, logic, or inherent understanding, rather than on gathering evidence from the world. For example, mathematical truths like "2 + 2 = 4" or the idea that "all bachelors are unmarried" are known a priori. These concepts are considered necessary and universally true, meaning they hold true regardless of how we observe or interact with the world. They form a foundation for certain kinds of knowledge that do not rely on empirical evidence.