TITLE: Contributions of Galois Theory to Mathematics
QUESTION [32 upvotes]: What are the major and minor contributions of Galois Theory to Mathematics? I mean direct contributions (like being aplied as it appears in Algebra) or simply by serving as a model to other theories.
I have my own answers and point of view to this question, but I think it would be nice to know your opinion too.

REPLY [2 votes]: The concept of a soluble group
has its origin in Galois theory, but it is nowadays an object of study in itself and
many important results in the modern theory of finite groups concern soluble
groups.