A conversion pixel is a small piece of code that is placed on a website or web page. It is used to track and measure conversions, which are specific actions that people take in response to an advertisement or marketing message.

When a person takes a conversion action, such as making a purchase or filling out a form, the conversion pixel sends a notification back to the advertiser or marketing platform. This notification includes information about the conversion, such as the type of action that was taken and the specific product or service that was involved.

Conversion pixels can be used to track a wide variety of different conversion actions, including purchases, sign-ups, form submissions, and downloads. They are often used in conjunction with advertising platforms and networks, which provide tools and services to help advertisers track and measure the return on investment (ROI) of their campaigns. Conversion pixels can be placed on websites or web pages using JavaScript, and they are often used in combination with other tracking and measurement tools, such as web analytics platforms.