What are these COOKIES?

I read about cookie. Think about it.Have questions, want to ask and get an answer , so I write here .
Cookies are stored in users browser, the cookie is in fact our passport online . Cookies are overwritten constantly , as their limited number . These files in search and on the websites of the displayed ads .
In connection with this question. We have a browser (without accounts Google and Yandex). For example today we were looking for how to make liver, found , closed. Tomorrow go in search and we will be everywhere flash is cookies or so ?
If it is PC sharing you today looking for cookies , tomorrow someone was looking for bricks, then the next day I find out that people before me cared about it . As I will talk about it. In this connection, the question of how the whole thing be stored ?
Let's say I am knowledgeable, I know what are cookies. Took database browser where data is stored on the cookie is the latest and installed them on each computer, to the browser. And then his PC will be information about what he alleged were looking for ?
June 10th 19 at 15:06
2 answers
June 10th 19 at 15:08
cookies are in fact our passport in network
no

Cookies are overwritten constantly , as their limited number
no

These files in search and on the websites ads
no, not because of. Cookies can be one of the factors that keeps track of the advertising network. If you erase cookies, the ads will not disappear (but may show another).

Took database browser where data is stored on the cookie is the latest and installed them on each computer, to the browser.
major advertising networks are much smarter than you think. In addition, it will be much more fun if you have the contrary - to copy someone else's cookies to yourself. You can go in a stranger's Vkontakte and put "the dark Lord" on the avatar. Or read mail, or to get dibs on a Bank account (although two-factor authentication is more common)

In General, cookies - the text string that the server sent to your browser. Moreover, for each domain, bind their cookies. And the browser will send this string in the headers of each request that it sends to the server (this can be disabled in the settings).
June 10th 19 at 15:10
Cookies are stored in users browser, the cookie is in fact our passport in network

Cookies are blocks of text generated by the server in certain situations. And nothing more.
Cookies are overwritten constantly , as their limited number

Nonsense, sorry. The volume of cookies may be limited but storage is limited only by disk size
These files in search and on the websites of the displayed ads .

I ought to say "thanks and these files..." because cookies are just one of the ways to target ads. About the "print browser" heard? More or less seriously to confuse advertisers you can only complete a readonly browser.
don't really want anything to twist, just wondering how is the package of requests, a"portrait" of the user . - abe_Sta commented on June 10th 19 at 15:13
well , so Google to the rescue :) the Theme of the print browser on Habre a couple of times were definitely considered - Esta_Upton commented on June 10th 19 at 15:16

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