  We review diverse two-dimensional models emerging on the world sheet of
non-Abelian strings in the low-energy limit. Non-Abelian strings are supported
in a class of four-dimensional bulk theories with or without supersymmetry. In
supersymmetric bulk theories we are mostly interested in BPS-saturated strings.
Some of these two-dimensional models, in particular, heterotic models, were
scarcely studied in the past, if at all. Our main emphasis is on the heterotic
N=(0,2) models. We describe their large-N solution. We briefly comment on
N=(0,1) models although so far they are not obtained on the the world sheet of
non-Abelian strings.
