Amazon used to offer a service called aStore.
It allowed you to create a very simple store using Amazons products. It was limited in features and did not rank in Google.
Amazon officially announced the retirement of Amazon aStores on 28th June 2017. Please see here for more details: https://affiliate-program.amazon.com/help/node/topic/202116720
Fresh Store Instant is a natural replacement for Amazon aStores providing many more features than was ever possible with an aStore.