Prime Day is the most anticipated mid-year promotion event held by Amazon worldwide. In addition to Prime members being able to purchase super-hot flash sales on this day, sellers can also increase their traffic and sales several times the usual amount on this day. Many sellers’ single-day sales exceed their usual sales in a week or even a month. It is a day when buyers are eager to buy and sellers are excited.

Prime Day was first launched in 2015 and has become the biggest shopping day of the year. In 2018, Prime Day even surpassed Cyber ​​Monday and Black Friday. "How to improve rankings on Amazon Prime Day?" Globally, this is the biggest sales day in Amazon's history. Last year, Prime members had 89 million visitors log on to the site and purchased 100 million products during the sales event. Sales on the event day grew by 150% over the previous year. It is expected that the marketing scope of Amazon Prime Day in 2019 will be larger. The sales will last longer.