  In this chapter, we discuss avalanches in glasses and disordered systems, and
the macroscopic dynamical behavior that they mediate. We briefly review three
classes of systems where avalanches are observed: depinning transition of
disordered interfaces, yielding of amorphous materials, and the jamming
transition. Without extensive formalism, we discuss results gleaned from
theoretical approaches -- mean-field theory, scaling and exponent relations,
the renormalization group, and a few results from replica theory. We focus both
on the remarkably sophisticated physics of avalanches and on relatively new
approaches to the macroscopic flow behavior exhibited past the
depinning/yielding transition.
