Explain how e-marketing information systems track customer behavior

What will be an ideal response?

Technically, e-marketing software tracks customer behavior by embedding in the HTML email a web beacon or web bug, which is a tiny, invisible image, typically a single pixel with a unique identifier. The image is actually located on the e-marketing server, and when the customer opens the message, a request is sent from the recipient's computer to retrieve the invisible image and download it. The request includes the date, time, and IP address of the computer making the request, and the unique identifier links the request to the customer's email address as well.