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The three main kinds of entities who work to track users and composite profiles are: Adverties, Publishier and Aggregators.

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The Advertisers are companies that have products or services to sell and therefore to market them.
The Publishers are companies that publish advertisement online, with web, page content, games...
The Aggregators are companies that collect information such as the business name, address, phone number, website, description and hour of operation.

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With the name of cookie we think about a biscuit. But it isn’t a biscuit!

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A cookie is a small piece of data sent from a website and stored on the user’s computer by the user’s web browser when the user is browsing.

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Cookies were designed to be a reliable mechanism for websites to remember arbitrary pieces of information that user’s previously entered info form fields such as names, address, passwords and credit card numbers.

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Perhaps most importantly authentication cookies are the most common method used by web servers to know the user is logged in with.

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As you can see an example is the Zara site. Here you can find the credentials that companies require to create your profile.