E-commerce has become one of the most popular online activities worldwide. E-commerce is defined as the buying and selling of goods and services over the internet, and data in the past five years shows that the retail e-commerce market grew from US$1.5 trillion in 2015 to US$4.9 trillion in 2021. Countries with the biggest e-commerce markets are China and the US, representing over 70% of global e-commerce sales.
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