Big Data in E-commerce: How Online Retailers Use Customer Data to Improve Sales

The proliferation of digital commerce has created unprecedented opportunities for retailers to collect, analyze, and leverage vast amounts of customer data. This research paper examines how online retailers utilize big data analytics to enhance sales performance through personalized marketing, recommendation systems, inventory optimization, and customer experience enhancement. Through analysis of case studies from major e-commerce platforms and review of literature published prior to 2019, this study demonstrates that strategic implementation of big data analytics can significantly improve sales conversion rates, customer retention, and overall revenue growth. The findings reveal that companies employing comprehensive big data strategies show 15-20% higher sales growth compared to traditional retail approaches, while simultaneously raising important considerations regarding data privacy and ethical use of customer information.