I prefer "vestigial DNA" over "junk DNA". These DNA sequences are analogous to toenails on manatees and the human vermiform appendix (or t!ts on a boar, if you prefer). Vestigial DNA may play a rudimentary role, such as gene spacing or in chromosome functions, but this role is obviously lesser than it's cousin "coding DNA". On top of that, some vestigial DNA is almost identical to coding DNA found in other species. Another description that I like is that vestigial DNA is evolutionary baggage.