So what is a memoir? A memoir is much like an autobiography, but is often aimed more toward a more specific series/timeline of events in a the life of the subject, often the writer, rather than the whole life of the subject.
What inspired this entry was that years ago, I saw the film October Sky, based on the Memoir Rocket Boys, by Homer Hickam Jr. My mother had gotten the film, and I watched it several times. Then a few years ago, after seeing the VHS tape laying around my parents' house, I got memoir itself, and watched the film as a comparison after rereading the memoir. Hickam did take some liberties in writing his memoir, as well as there being the same in the film; as much as I might not like that thought, if it helps the story, its not necessarily wrong.
Now, what might prompt the writing of a memoir? Basically, to help recount one's personal experiences and histories. It would be a way for a person to tell the family lore in a way to help preserve the family story. It could also be a way to publish material that might be ultimately bound into an autobiography in the future. Knowing what needs to be told should be a key point of any memoir, and having the audience relate to it.
Gotta decide what next month's topic is