Heritability is a measure of how much of the variation in a trait within a population can be attributed to genetic differences. It is expressed as a proportion, ranging from 0 to 1. A heritability of 0 means that genetics do not contribute to the variation in the trait, while a heritability of 1 indicates that all the variation is due to genetic factors. For example, the heritability of height is estimated to be around 0.8, meaning that 80% of the variation in height is due to genetic factors.
