Abstract: 
An enormous amount of four dimensional effective field theories can be obtained from compactifications of string theory, forming a set known as the string landscape. It has been suggested that, beyond this landscape, there exist consistentlooking effective field theories that cannot be embedded into UV complete theories of quantum gravity, in particular into string theory. They are said to belong to the swampland. I will describe some of the conjectures that define the swampland and implications they have on models of inflation and dark energy, addressing recent concerns about the KKLT proposal to obtain de Sitter vacua in string theory.
