A tumor necrosis factor receptor-associated factor that acts as a specific signaling adaptor protein for the edar receptor and plays an important role in ectodermal development. It binds to edar receptor via its C-terminal death domain region and to other specific TNF receptor-associated factors via its N-terminal domain. Loss of function of edar-associated death domain protein is associated with AUTOSOMAL RECESSIVE ANHIDROTIC ectodermal dysplasia.