As a famous quote from Wechsler says above, intelligence refers to the ability to understand, act, interpret, predict the future , establish and manage relationships, information, concepts and abstract symbols. It is a word commonly used to express and show progress beyond the present. It is a process of cognition. “Cognition refers to how we acquire, store, retrieve and use knowledge” (Matlin, 1996). All basic processes such as learning, perception, memory, concept formation, thinking, reasoning, problem solving, decision making and creativity are terms related to the word intelligence. A person's intelligence is expressed through their intellectual activities, which can be measured formally or informally. An informal assessment of one's intellectual activities can be made from certain acts, such as solving simple puzzles, filling a gap, correctly answering short problems, simple numerical abilities, explaining a concept and adapting to a new situation . It is an abstract concept. This cannot be observed. It can only be estimated through a person's performance in tests or reliving situations. The concept of intelligence includes terms such as emotional intelligence, spiritual intelligence, practical intelligence, social intelligence, vocal intelligence, and musical intelligence. There are many ways to determine what the word intelligence means, but they all come to the same conclusion and