What is the central concept in Two-Dimensional Conformal Field Theory?

Conformal symmetry lies at the heart of Two-Dimensional Conformal Field Theory (CFT). It refers to transformations that preserve the angles between curves, the lengths of curves, and the ratio of areas enclosed by curves. These transformations are essential for understanding the symmetries of CFT, as they describe how the theory behaves under changes in the conformal structure of spacetime. Conformal symmetry plays a fundamental role in many aspects of CFT, from determining correlation functions to classifying primary fields.