  Effective field theory provides a powerful framework to exploit a separation
of scales in physical systems. In these lectures, we discuss some general
aspects of effective field theories and their application to few-body physics.
In particular, we consider an effective field theory for non-relativistic
particles with resonant short-range interactions where certain parts of the
interaction need to be treated nonperturbatively. As an application, we discuss
the so-called pionless effective field theory for low-energy nuclear physics.
The extension to include long-range interactions mediated by photon and
pion-exchange is also addressed.
