<span>A concept is the way in which a category or class of objects is represented mentally. Concepts allow individuals to discern class membership or non-membership, relate different classes of objects, and provide context for learning new information about classes and class membership. There is wide debate about the way in which categories and classes are mentally represented and defined. The way in which concepts are learned can depend on the age of the learner, whether or not explicit instructions are provided, and the type of category or class the concept represents.</span>
