Concepts are mental categories for objects and events, which are similar to each other in one or in more than one way.

Role of concept in thinking process:

1. Concept formation helps us in organizing our knowledge so that whenever we access our knowledge we can do it in less time of effort.

2. Concepts used in thinking are neither deal nor unambigous. They are fuzzy. They overlap one another and are poorly defined.

3. To make thinking systematic a prototype is required. A prototype is a best representative member of category.