Intelligence is a difficult concept to define, because it can mean different things to different people. Generally speaking, intelligence can be defined as the ability to think abstractly, to solve problems, and to understand and use information.There are different types of intelligence, and some people may be more intelligent than others in certain areas. For example, someone may be good at math and science, but not so good at reading and writing. Or someone may be good at understanding and using language, but not so good at logical reasoning.Some intelligence tests measure how quickly and accurately a person can perform certain tasks. Other tests measure more general cognitive abilities, such as memory, attention, and perception.Intelligence is thought to be influenced by both genetic and environmental factors. Some research suggests that intelligence is mostly determined by genetics, while other research suggests that it is mostly determined by the environment. It is likely that both genetics and the environment play a role in intelligence.