A pixel tag, also known as a web beacon or tracking pixel, is a small, transparent image or line of code embedded in a website or email that allows for the collection of data about user behavior. These tiny tags are used by advertisers and marketers to track website visits, clicks, and conversions, providing valuable insights into the effectiveness of online campaigns. While invisible to the naked eye, pixel tags play a crucial role in targeted advertising and personalized content delivery, making them an essential tool in the digital marketing landscape.