  This talk surveys a broad range of applications of quantum field theory, as
well as some recent developments. The stress is on the notion of effective
field theories. Topics include implications of neutrino mass and a possible
small value of $\sin(2\beta)$, supersymmetric extensions of the standard model,
the use of field theory to understand fundamental issues in string theory (the
problem of multiple ground states and the question: does string theory predict
low energy supersymmetry), and the use of string theory to solve problems in
field theory. Also considered are a new type of field theory, and indications
from black hole physics and the cosmological constant problem that effective
field theories may not completely describe theories of gravity.
