Ko-so-a-do kotoba consist of words with the initial letters of the demonstrative pronouns kore, sore and are, and the interrogative pronoun dore, which means "which". Kotoba means "words". The ko-so-a-do kotoba used to express location are koko meaning "here", soko meaning "there", asoko meaning "over there" and doko meaning "where?"
Ko-so-a-do kotoba are very useful because you can use them instead of saying concrete names. But, of course, you have to be sure the person you are talking to knows what you are referring to! There are often misunderstandings between long-married couples. For example, the husband says "Bring me that!" to his wife, meaning his newspaper, but instead his wife hands him his glasses!
