A back-story is a literary device[?] often employed in order to lend a story depth or verisimilitude. Characters or events related to a story may only be given cursory treatment so as not to distract from the central plot development.
Probably the most extensive back-story ever created was that created by J. R. R. Tolkien for his Middle-earth stories.
... y, r, l, v. All of these but r have nasalized forms. Sanskrit also has palatal, retroflex, and alveolar sibilants. Rounding out the consonants are the voiced and ...