Knowledge is the awareness, understanding, and familiarity a person has with facts, information, concepts, or skills acquired through experience, education, or reasoning. It is what we know—as opposed to what we believe, feel, or guess.

There are different types of knowledge:

1. Explicit knowledge – Clearly articulated and easily shared or written down (e.g., facts, textbooks, manuals).

2. Implicit or tacit knowledge – Gained through personal experience and harder to express (e.g., knowing how to ride a bike).

3. Theoretical knowledge – Understanding of principles and ideas (e.g., knowing why gravity works).

4. Practical knowledge – The ability to apply knowledge in real situations (e.g., using coding skills to build a website).

Philosophers often define knowledge as "justified true belief", though this definition has been challenged and debated over time.

Would you like a philosophical, scientific, or practical perspective on it?