  This in an introduction to random matrix theory, giving an impression of some
of the most important aspects of this modern subject. In particular, it covers
the basic combinatorial and analytic theory around Wigner's semicircle law,
featuring also concentration phenomena, and the Tracy-Widom distribution of the
largest eigenvalue. The circular law and a discussion of Voiculescu's
multivariate extension of the semicircle law, as an appetizer for free
probability theory, also make an appearance.
  The material here was presented in the winter term 2019/20 at Saarland
University in 24 lectures of 90 minutes each. The lectures were recorded and
can be found online at
https://www.math.uni-sb.de/ag/speicher/web_video/index.html.
