In online advertising, a cookie-based technology that uses a simple code to anonymously ‘follow’ your audience all over the Web. Here’s how it works: you place a small, unobtrusive piece of code on your website (this code is sometimes referred to as a pixel). The code, or pixel, is unnoticeable to your site visitors and won’t affect your site’s performance. Every time a new visitor comes to your site, the code drops an anonymous browser cookie. Later, when your cookied visitors browse the Web, the cookie will trigger your retargeting provider to serve ads. The objective is to remind a visitor to complete a transaction.