Idioms are phrases in language that do not make literal sense but have understood meanings. While the origins of many idioms are unknown, they exist in all cultures. Most idioms originated from ancient literature or films and reference well-known writers like Shakespeare. Learning the backgrounds of idioms can help remember them. Idioms should be used appropriately and add richness to speech by increasing vocabulary, though their grammar and meaning must stay fixed. Idioms can also be fun to use in writing as imagery to emphasize important points to readers.