Ray Kurzweil, the computer scientist, defined intelligence as “set of skills that allows humans to solve problem with limited resources.” The skills expected from an intelligent person are learning, abstract thought, planning, imagination, and creativity. This list covers the most important aspects of human intelligence.
In fact, it is an arduous task for the scientists and philosophers to define intelligence. And there is no proper definition exists today due to the complexity of the topic.
Intelligence is commonly considered as the ability to learn, to deal with different situations, to acquire, understand and to apply knowledge.
Intelligence requires knowledge. Power of knowledge is able to make a person intelligent. It enables one to reason, analyze, manipulate and act in a given situation.