The is a piece of code that can be added to the website to determine the effectiveness of Facebook ad campaigns by tracking the action of people on the site. It helps you reach out to visitors who have visited your website but have not made a purchase say the experts. You can implement the default (All Pages) Facebook pixel and Facebook event codes with the help of Google's Tag Manager. The Facebook Pixel custom template from the Community Template Gallery must be added to your workspace in GTM first suggests the experts. The gallery can be accessed in three ways: through the top-right New Feature notification, tag configuration, or left navigation. According to the experts from , if you know everything about Facebook Pixel, you will have fewer chances of making the mistake that most new advertisers make of launching a few campaigns and then abandoning them.