When the ancient Greeks started to ask their questions, they encountered an underlying problem with the answers. “But, how can we know that”?
This, and similar questions about what sort of thing we can know, how we can acquire knowledge and the nature of knowledge itself has formed the branch of philosophy known as Epistemology.
Some philosophers believe that we acquire knowledge through experiences and through what we acquire through our senses, this is better known as Empiricism.
Other philosophers believe that we primarily acquire knowledge by a process of reasoning, a view known as Rationalism.
Other areas again of Epistemology meanwhile, deal with the connection between knowledge and concepts such as truth and belief.
Next Philosophy in 5 article:
What is Ontology?