eMarketer shows that retail sales will increase to $4.058 trillion in 2020, making up 14.6% of total retail spending. Retail stores have an advantage of having a presence offline as well as online. 68% of shoppers said that they regularly research products in-store before they purchase them online. The millennials prefer shopping online, than going to a retail store and searching for products. Marketers and brands are using digital tools such as Web Push Notifications to maximize customer engagement.