An autosome is a non-sex chromosome. Humans have 22 pairs of autosomes, which are numbered 1 through 22, and one pair of sex chromosomes (the X and Y).
Autosomal DNA is DNA from one of our chromosomes located in the cell nucleus. It generally excludes the sex chromosomes. Humans have 22 pairs of autosomal chromosomes and a pair of sex chromosomes. Source: "autosome". [...]