The main purpose of a memoir is to inform.
Explanation:
A memoir is a narrative consisting of memories an individual writes about. These can be memories of particular moments or private or public events the writer, who is referred to as a memoirist or a memorialist, experiences.
Since the late 20th century, memoirs are considered a type of autobiography (or biography), but they focus on a certain moment, event, or period of the person's life, while (auto)biographies deal with their entire life or at least most of it. The information the memoirist conveys is considered factual.
The main purpose of the memoir is informational. There are many historical things we wouldn't know without memoirs. Of course, we may encounter some entertaining episodes from the memoirists' lives or even some lessons, but the main goal of a memoirist is to inform about their experiences and circumstances.
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