A Facebook pixel is a code generated at your Facebook Events manager. It collects data that is based on the actions that people take on your website.

From now on, you don’t need to know how to insert the Facebook pixel in the code. You can add it via simple integration that only requires you to copy the Facebook pixel in your Facebook Events manager and paste it in the Analytics tab in the site settings.

You can place the code on your website to track and optimize Facebook ads, build lookalike audiences for future ads, and launch remarketing campaigns. 

If you’re ready to check, take a look at Facebook's instructions on how to create and install the Facebook pixel.