| Summary: | Quantum Field Theory provides a fundamental framework for modelling and predicting
experimental results in high energy particle physics. However, the calculated quantities often
diverge, and so a renormalisation framework was introduced to extract meaningful, finite
quantities from the theory. In the process, counterterms have to be introduced to cancel
off the diverging terms. In renormalisable theories, all divergences can be absorbed into
the redefinitions of the mass, field and the coupling constant, but this fact would seem to
fortuitous. Wilsonian effective field theory gave a different interpretation of the framework
and gave physical insight into how it worked. In this report, an introduction to field theory
is presented and a discussion of the Wilsonian effective theory
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