NEUTRAL DNA. “The rest of the genome, Birney said in 2012, is not–as some would have it — just biological “noise.” He prefers to call that DNA “biologically neutral,” meaning “that there are totally reproducible, cell-type-specific biochemical events that natural selection does not care about.”
https://www.geneticliteracyproject.org/2014/08/05/how-much-of-human-dna-is-doing-something/