What is the difference between a pixel and a cookie?

Advertising in media has always been based on audience and like it or not, digital media is the most measurable medium out there.
Cookies and pixels are different tools used to get a better understanding of the users on the website.
But, what’s the difference between a pixel and a cookie?
Before answer, let’s see what a web server is: a server is a computer that delivers data to the user’s computer.
– A web server delivers websites
– An ad server delivers ads
We can define a cookie as the piece of code placed on user’s browser by a web server. It can log the data needed to record user’s behaviour and contains the user’s unique ID.
A pixel is a piece of code the publisher place on its website to fire a cookie. It uses a 1×1 transparent image to serve as a bridge between the web server and the ad server.
Pixels deliver info directly to a server, so they do not rely on the user’s browser (vs cookies that store that info in there). They can follow users cross-devices and users cannot disable pixels like they can disable cookies.
It’s clear that the difference between pixel/cookie is how the info is delivered and where it is kept.
Two major limitations: both are browser-bound and don’t collect personally identifiable info, but instead a unique ID of that user.
-LB
Other sources: see in the LinkedIn comments.
Previously posted by Luca Brighenti via LinkedIn. 
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