What are these COOKIES?

Question

Browsers

Read about cookies. I'm thinking about it. Questions arise, I want to ask them and get an answer, that's why I'm writing here.
Cookies are stored in the user's browser, cookies are essentially our passport to the web. Cookies are permanently overwritten as they are limited in number. Thanks to these files, advertisements are shown in search and on websites.
In connection with this question. We have a browser (without Google and Yandex accounts). Let's say today we were looking for how to make a liver, we found it, we closed it. Tomorrow we'll go into the search and will we see cookie ads everywhere or something like that?
If this is a shared PC, today you were looking for cookies, tomorrow someone was looking for bricks, then the day after tomorrow I will find out that people before me were interested in this. Since advertising will tell me about it. In this connection, the question is how long this whole thing is stored?
Let's say I'm so knowledgeable, I know what cookies are. I took the browser database, which stores data about the latest cookies, and installed them on a friend's computer, in the browser. And then he will have information on his PC about what he was supposedly looking for?

Answer 1

cookies are essentially our passport on the network

No

Cookies are permanently overwritten as there are only a limited number of them.

No

Thanks to these files, ads are shown in search and on websites.

no, not thanks. Cookies can be one of the factors that the ad network monitors. If the cookies are deleted, the ads will not disappear (but they may show another one).

I took the browser database, which stores data about the latest cookies, and installed them on a friend's computer, in the browser.

serious ad networks are a lot smarter than you think. In addition, it will be much more fun if you can do the opposite - copy other people's cookies to yourself. You can go to someone else's VKontakte and put the "black lord" on the profile picture. Or read your mail, or steal money from your bank account (although now two-factor authentication is becoming more common)
In general, a cookie is a string of text that the server sent to your browser. Moreover, each domain has its own cookies. And the browser will send this string in the headers of every request it sends to this server (this can be disabled in the settings).

Answer 2

Cookies are stored in the user's browser, cookies are essentially our passport to the network

Cookies are text blocks generated by the server in certain situations. And no more.
Nonsense, sorry. The amount of cookies may be limited, but their storage is limited only by the size of the disk
You should have said "thanks to these files too..." since cookies are just one way to target ads. Have you heard of browser fingerprinting? More or less seriously confusing advertisers is only possible with a full readonly browser.