For example, suppose you want to learn about the history of jazz. You might start by reading the article on jazz in an encyclopedia. If you think you'll need the information only once in a while, you may simply put the book back on the shelf. you'll need some of the facts more often, you'll probably take notes. However, if you want to be able to speak about jazz off the cuff, without having to refer to any writing, you may memorize a few facts that is, store them in your head.