Intelligence is the brain's ability to learn and remember things, to adapt easily to new situations and to think abstractly. The intelligence of a person can be measured with special tests. The so-called intelligence quotient (IQ) is determined as a meaningful value.
An IQ of 85 to 115 is considered "normal intelligence". IQ in the range of 70 to 85 is below average; in this case, it is referred to as a learning disability. If the measured value is less than 70, it is an intellectual disability. This is divided into the four severity levels slightly (IQ from 69 to 50), moderately (IQ from 35 to 49), severely (IQ from 20 to 34) and most severe loss of intelligence (IQ under 20).