  We provide an overview of the string landscape and the Swampland program. Our
review of the string landscape covers the worldsheet and spacetime
perspectives, including vacua and string dualities. We then review and motivate
the Swampland program from the lessons learned from the string landscape. These
lecture notes are aimed to be self-contained and thus can serve as a starting
point for researchers interested in exploring these ideas.
  These notes are an expanded version of two courses "The String Landscape and
the Swampland" taught by C.~Vafa at Harvard University in 2018 with a focus on
the landscape, written by M.~J.~Kang with additional material from N.~B.~Agmon,
and in 2022 with a focus on the Swampland, written by A.~Bedroya.
