Conjunctions are used to combine two clauses together. There are independent (main) and dependent (subordinate) clauses. Independent clauses are combined using a coordinating conjunction, which does not alter the word order of the joined clauses. Dependent clauses, however, are combined with independent clauses to form complete sentences using subordinating conjunctions. These conjunctions change the word order of the dependent clauses they appear in by shifting the conjugated (finite) verb to the end of the clause (not necessarily the end of the whole sentence; for example, if the sentence begins with a dependent clause).
Besides subordinating conjunctions, interrogative pronouns used in indirect questions also shift conjugated verbs to the end of clauses.