When you visit a web page, your browser sends a request to the site's server to process the request. Cookies are not spam, worms, or viruses, but rather files sent by websites that are stored in your browser and collect data about visitors. They also serve to send you personalized advertising and collect technical data.
There are various types of cookies, depending on their purpose:
Technical
Traffic control, session identification, content storage.
Personalized
Language, browser type, regional settings.
Analytics
Measuring user activity and browsing behavior.
Advertising
Management of advertising spaces that the publisher has included on the website.
Behavioral Advertising
Creation of a specific user profile.
These small files collect key information for presenting online advertising, especially for personalizing ads. The job of cookies is to "tell" brands and companies about users' online behavior in order to place ads based on our tastes and interests.
Among other things, they can collect this type of information: email addresses and passwords, phone number, address, IP address, computer operating system, browser type, pages visited.
Advantages and disadvantages
Most websites require us to accept them in order to continue using the service—which is why they are required to provide us with detailed information about them—although there are ways to disable and block them.
If you do not want the information collected by cookies to be stored on your computer, you can delete them in the "Tools" section and then click "Clear browsing data." On mobile, you'll find this option in "Settings," then "Privacy," and finally, "Delete cookies."
But it's not always necessary to reject them; the cookie policy has its advantages and disadvantages. On the one hand, they can be a great help in improving the internet experience, creating a user profile and avoiding having to fill out forms, passwords, and endless contact forms over and over again.