  We review two-dimensional QCD. The report contains:
  1. Introduction.
  2. QCD$_2$ as a field theory
  2.1 The 1/N expansion and spectrum, 2.2 Ambiguity in the self-energy of the
quark, 2.3 Polyakov--Wiegmann formula and gauge interactions, 2.4 Strong
coupling analysis, 2.5 A Lagrangian realization of the coset construction, 2.6
Chiral interactions.
  3. Pure QDC$_2$ and string theory,
  3.1 Introduction, 3.2 Wilson loop average and large-N limit, 3.3 String
interpretation, 3.4 Collective coordinates approach, 3.5 Phase structure of
QCD$_2$,
  4. Generalized QCD$_2$ and adjoint-matter coupling, 4.1 Introduction and
motivation, 4.2 Scalar and fermionic matter coupling; quantization 4.3 The
Hagedorn transition; supersymmetry 4.4 Landau--Ginzburg description; spectrum
and string theory
  5. Algebraic aspects of QCD$_2$ and integrability
  5.1 $W_\infty$ algebras for colourless bilinears 5.2 Integrability and
duality 5.3 Constraint structure of the theory 5.4 Spectrum and comparison with
the 1/N expansion 5.5 Integrability conditions and Calogero-type models 5.6 QCD
at high energies and two-dimensional field theory
  6. Conclusions, 3 appendices.
