What are the famous applications of big data?

In a supermarket, people found a particularly interesting phenomenon through big data analysis: diapers and beer, two unrelated commodities, were actually put together. But this strange move has greatly increased the sales of diapers and beer. This is not a joke, but a real case of Wal-Mart supermarket chain in the United States, which has always been talked about by merchants. It turns out that American women usually take care of their children at home, so they often ask their husbands to buy diapers for their children on their way home from work, and husbands will also buy their favorite beer at the same time.