Growth in ecommerce rarely comes from doing more of everything. It comes from knowing where to focus—which channels bring in new customers, what they cost, and how to improve results over time. That focus matters as online retail gets more competitive. Total US ecommerce sales reached $1.23 trillion in 2025, up 5.4% year over year, and ecommerce accounted for 16.4% of total retail sales in 2025.