  We discuss the direct measurement of the trilinear vector boson couplings in
present and future collider experiments. The major goals of such experiments
will be the confirmation of the Standard Model (SM) predictions and the search
for signals of new physics. We review our current theoretical understanding of
anomalous trilinear gauge boson self-interactions. If the energy scale of the
new physics is $\sim 1$ TeV, these low energy anomalous couplings are expected
to be no larger than ${\cal O}(10^{-2})$. Constraints from high precision
measurements at LEP and low energy charged and neutral current processes are
critically reviewed.
