» For the compilation-related term, see Function prologue.:For the American magazine, see Prologue Magazine. For the computer programming language, see Prolog. Prologue (Greek πρόλογος prologos, from προ~, pro~ - fore~, and lógos, word), or prolog, is a prefatory piece of writing, usually composed to introduce a drama. The Greek prologos included the modern meaning of prologue, but was of wider significance, emb… (More on Prologue)