Definition:
A pixel is a small piece of code (javascript) with which information can be collected about visitors to a website, such as what actions they carried out. The idea is that this data that is collected, will then serve to send users ads that are relevant to them or can generate some type of interest.
Pixels are very useful to measure the performance of a campaign, track conversions and / or create audiences based on the behavior of each user.
Types of pixels
Remarketing pixels: the purpose of these pixels is to track visitors to a website, and then send advertising campaigns to users who left the page without taking any action, such as the purchase.
Conversion pixels: Track sales or the advertising campaign.
What are the most common pixels
Among the most used Pixels we find: