TITLE: Use of indiscernibles in model theory
QUESTION [12 upvotes]: What is the main use of indiscernibles in model theory? reading through Chang and Keisler's Model Theory it seems that the main motivation for indicernibles is for getting many non-isomorphic models for a theory (like the theory of dense linear order without endpoint).
Also, can you recommend the best source for reading about indiscernibles and their uses?

REPLY [2 votes]: Indiscernibles are bounds for Skolem functions in all model-theoretic proofs of unprovability.