  These notes provide an introduction toward Wilson loops in N=4 supersymmetric
Yang-Mills theory with a focus toward their integrability properties. In
addition to a brief discussion of exact results for the circular Wilson loop
and the cusp anomalous dimension, the notes focus on non-local symmetries,
utilizing the integrability of the minimal surface problem that appears at
strong coupling. This work is based on lectures given at the Young Researchers
Integrability School and Workshop 2018. To appear in a special issue of J.
Phys. A.
