An interrogative word is a function word used for the item interrupted in an information statement. Interrogative words are sometimes called wh-words because most of English interrogative words start with wh-. In English, they are used in questions (Where is he going?) and interrogative content clauses (I wonder where he is going); their forms are also used as relative pronouns in certain relative clauses (The country where he was born) and certain adverb clauses (I go where he goes). These uses are all found in various other languages as well.