As stated in a famous Wechsler quote, intelligence refers to the ability to understand, act, interpret, predict the future, realize and manage relationships, information, concepts and symbols abstract. 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. One's intelligence is expressed through one's intellectual activities, which can be measured formally or informally. Informal evaluation of one's intellectual activities can be done by some acts, such as simple puzzle solving, filling a gap, answering short problems correctly, simple numerical skills, explaining a concept, and adapting to a new situation. It's an abstract concept. It cannot be observed. It can only be estimated through one's performance in tests or real-life 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