gauge theory, yang mills

[scariari]

what do these terms have to do with eachother?

yang mills
gauge theory
't hooft
instanton

[humanino]

Yang and Mills generalized the concept of gauge theory in the case of non-cummutative symmetry
't Hooft (and Veltman) proved the renormalizability

Instanton is a term coined by 't Hooft. See this thread or this one or this more compete one