1. Explicit knowledge refers to knowledge that has been formalised and can be easily communicated and shared.
2. Tacit knowledge refers to knowledge that is difficult to articulate and communicate formally.
3. Nonaka discusses two types of knowledge - explicit and tacit knowledge.
4. Explicit knowledge is formal, systematic knowledge that can be articulated in formal language.
5. Tacit knowledge is personal knowledge embedded in individual experience and involves intangible factors such as personal beliefs, perspective and value systems.