The document discusses reading comprehension and the difference between reading individual words and comprehending full sentences or texts. It notes that a nonsense sentence containing real words like "Banana blue tree happy sing" demonstrates how one can understand each word separately but the sentence makes no sense as a whole. It defines reading comprehension as understanding what one reads through an interactive process before, during and after reading. Comprehension requires understanding both the vocabulary used and having background knowledge - if the individual words are not comprehended, the overall meaning of the text will be lost.