"Conjunction Junction" is a popular educational song from the animated series Schoolhouse Rock!. It teaches viewers about conjunctions, which are words that connect phrases and clauses in sentences. The song features a train theme, where the train cars represent different parts of a sentence being linked together. The main focus of the song is on the conjunctions "and," "but," and "or." These words help to combine ideas and create more complex sentences. By using catchy melodies and engaging visuals, "Conjunction Junction" effectively helps children understand the role of conjunctions in language.