Zero-party data is customer-explicitly shared information that can help marketers personalize marketing campaigns, ad targeting, and messaging while respecting customers' privacy. This type of data is different from third-party data, second-party data, and first-party data, which are collected through various means. Zero-party data has its pros and cons, but it offers a more targeted approach to marketing, making it easier for businesses to drive revenue with highly personalized campaigns. To collect and activate zero-party data, marketers can leverage various channels, such as texting, surveys, product quizzes, and preference centers. By combining this data with Customer Data Platforms (CDP) and analytics tools, businesses can create rich customer profiles, deliver personalized messaging across omni-channel campaigns, and thrive in a cookieless world where privacy changes impact marketing.