The document discusses the uses of apostrophes. It begins by stating that apostrophes are used to show possession or contractions. There are three main uses: to show possession of nouns, to form contractions by combining two words, and to form plurals of letters and numbers. For possession, an apostrophe is added after the singular noun or after the plural noun if it does not end in "s". Contractions are formed by combining two words and omitting letters. Apostrophes are also used to form plurals of letters, numbers, and irregular plural nouns. The document provides examples for each use.