What facts are known about the world. It is what is consciously able to be recalled independent of context ("knowing what" not "knowing how"). 

University of Michigan - Ann Arbor

Some psychologists make the distinction between two major types of knowledge:
- Explicit knowledge (i.e., factual, taught in school)
- Tacit knowledge (i.e., procedural, wisdom)

Two Major Types of Knowledge (Tacit and Explicit)

Explicit memory

Aronson, Elliot, and Joshua Aronson. The Social Animal. Worth Publishers, Macmillan Learning, 2018.

The Social Animal

People unconsciously use knowledge about the world when making judgments. Tacit knowledge us usually considered procedural ("knowing how" not "knowing what") and resembles wisdom.

Tacit knowledge

Types of explicit memory

Various researchers distinguish between memory drawing from experience vs. memory drawing from knowledge.

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