A priori knowledge refers to information that is known independently of experience. This type of knowledge is often associated with logical reasoning and mathematical truths. For example, the statement "all bachelors are unmarried" is considered a priori because it can be understood without needing to observe any bachelors. In contrast to a posteriori knowledge, which relies on empirical evidence and experience, a priori knowledge is often seen as universal and necessary. Philosophers like Immanuel Kant have explored the implications of a priori knowledge in understanding human cognition and the nature of reality.