The document discusses obsolete words and practices, including the art of letter writing becoming obsolete. It provides the definition of obsolete as a word or practice that has gone out of use or is outdated. Examples are given of habits considered outdated by youth, such as retiring to bed early or waking up early on holidays. The document also suggests that many youth think writing letters is an absolute waste of time and that texting and emails can replace letters. As a result, the art of letter writing is slowly becoming obsolete or falling out of use.