Etale Cohomology and the Weil Conjectures

This was prepared for Matt Satriano's PMATH 965 course on algebraic stacks at the University of Waterloo in the Winter 2022 term. We give a quick introduction to etale and l-adic cohomology groups of a scheme, and discuss how they were used to prove the Weil conjectures by Grothendieck, M. Artin, Verdier, Dwork, and Deligne.