  We classify the automorphic representations (over number fields) and the
irreducible admissible representations (over local fields) of unitary groups
which are not quasi-split, under the assumption that the same is known for
quasi-split unitary groups. The classification of automorphic representations
is given in terms of automorphic representations of general linear groups. The
classification of irreducible admissible representations is given in terms of
Langlands parameters.
