Personalization and customization are important strategies for e-commerce, but they differ in their approaches. While customization involves users selecting their preferences, personalization is done for the user based on their data. Both can improve the user experience by tailoring the experience, though personalization relies more on inferred interests from user data using techniques like machine learning. Personalization is becoming more widely used as it can increase engagement, conversions, and loyalty for e-commerce companies and other digital platforms.