The 2021 Ecommerce Personalization Benchmark Report reveals that 91% of shoppers abandon online retailers over poor experiences, with 77% desiring more personalized interactions. Retailers investing in personalization see significant returns, including 4x ROI and improved metrics like conversion rates increasing by 45% and cart abandonment rates dropping to 46%. Despite these benefits, many retailers face challenges such as data collection issues and insufficient tools, emphasizing the need for immediate action to enhance personalization efforts.