User data is information that is collected, processed, and stored about users of a product, service, or platform. In the context of advertising and marketing, user data can include a wide range of personal, behavioral, and technical information, such as age, gender, location, interests, preferences, habits, or devices. User data can be collected from a variety of sources, such as cookies, mobile device IDs, social media profiles, or surveys, and it can be used for different purposes, such as segmentation, targeting, personalization, or measurement. Advertisers often use user data to better understand and target their audience, and to improve the relevance, performance, and effectiveness of their advertising campaigns. User data can also be valuable for advertisers in terms of insights, trends, or competitive intelligence. However, user data can also be sensitive or private, and it can be subject to different laws and regulations regarding data protection, privacy, and consent.