A person's IQ is the score they get on a series of problem-solving tests. Your IQ, according to some experts, is a reflection of your intelligence.
If you've ever taken a standardized test to find out how smart you are in comparison to the average person, you probably know what your IQ is. The average IQ for a person your age is 100, so if yours is higher, it means you're unusually intelligent — either that or you're really good at taking tests. IQ is an abbreviation of intelligence quotient, a term invented in 1912 by the German psychologist William Stern.