Research and theory in cognitive science have shown that there may be several kinds of knowledge. four major categories of knowledge based on a taxonomy of learning outcomes (Anderson et al., 2001):
1. FACTUAL, 2. CONCEPTUAL, 3.PROCEDURAL,AND 4.METACOGNITIVE.
The first two types factual and conceptual, constitute knowledge of what,and the last two type, procedural and metacognitive constitute knowledge of how to. Similarly, factual and procedural knowledge constitute low level knowledge whereas conceptual and metacognitive constitute high level knowledge.

1. Factual knowledge

Factual knowledge consists of the basic elements students must know to be acquainted with a discipline or solve problems in it. It includes knowledge of terminology and specific facts. For example, within an adventure game, students may learn that China is in Asia, or from the instructions of a game, students may learn that start-up disk refers to a 3.5-inch square disk that fits in a disk drive. /Subtype/ Examples Factual Knowledge -discrete, isolated content elements Knowledge of terminology Technical vocabulary Knowledge of specific details and elements Ten biggest cities in the world

2. Conceptual knowledge

Conceptual knowledge consists of the interrelations among the basic elements within a larger structure than enable them to function together(Anderson et al., 2001, p. 29). It includes knowledge of categories, principles, and models. For example, students may learn principles such as add s to make a noun plural from a word game, or students may form a mental model of how a word process or works.
http://www.scribd.com/doc/14554355/Knowledge-Types-Revised