  The Swampland program aims to distinguish effective theories which can be
completed into quantum gravity in the ultraviolet from those which cannot. This
article forms an introduction to the field, assuming only a knowledge of
quantum field theory and general relativity. It also forms a comprehensive
review, covering the range of ideas that are part of the field, from the Weak
Gravity Conjecture, through compactifications of String Theory, to the de
Sitter conjecture.
