A tracking pixel is a small, invisible image embedded in emails or web pages that helps collect data about user behavior. When a user opens an email or visits a website containing a tracking pixel, it sends information back to the server, such as the time of access and the user's IP address. This data is valuable for marketers and website owners to understand how their content is being interacted with. Tracking pixels are commonly used in digital marketing and analytics to measure the effectiveness of campaigns. They can help businesses assess user engagement, track conversions, and optimize their strategies based on real-time data. By analyzing this information, companies can improve their outreach and better target their audience.