system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What exactly is IQ?
gpt
It stands for Intelligence Quotient and it is a scale that was created to help quantify intelligences and compare them to each other.  100 was set as the average, most common level of intelligence. The center of the distribution of intelligences. 

How you define intelligence is another question entirely. There are many kinds of intelligence, and all IQ tests are biased in some way, but your theoretical IQ does exist as a rank of your intelligence compared to the population, even if there is no real way of ever knowing what exactly it is.