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Without such a mechanism the site would not know whether to send a page containing sensitive information or require the user to authenticate themselves by logging in.

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

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Cookies were designer to be a reliable mechanism for  websites to remember stateful information or to record the user’s browsing activity, they can also ne used to remember arbitrary pieces of information that the user’s previously entered info form fields such as names, addresses, passwords and credit card numbers.

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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 with the user is browsing.

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Data Aggregators compiles information from databases or partner websites on individuals and sell that to advertisers to target ads to know more about data Aggregators.

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The website don’t really have and information about who you are on your profile since you did not authenticate to any of these websites, but they can stilo guess your age, sex and other details from your reading and browsing habits.

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These companies can also understand our location. When we browse a website the site places tracking cookie in your web browser.

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The Advertisers are companies than have products or services to sell and to market them.
The Publisher 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 hours of operation.

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The three kinds of entities who work together to track users and composites profiles are the Advertisers, Publisheers and Aggregators.