At first glance, it would seem to a person familiar with using the resources of the global Internet network that, in addition to annoying advertising on websites, there are no special features: the selected program for viewing pages (browser) sends requests, and distant servers return a response.
In fact, everything is a little more complicated and there are some features that significantly expand the request-response scheme. One of them is cookies. They are small files of 4 kilobytes in size, containing certain textual information. Often users do not even suspect that their browser is actively using cookies. When a user Internet client accesses the server, the latter sends a special file to the computer - cookies. It contains information that identifies the user. In the future, each new connection to this resource begins with the browser sending such a file to the server. As a result, the user logs into the site already with his username / password, and the page is displayed exactly as it was configured during the previous visit. Here is an example with a TV program site:the visitor registers and selects a list of displayed channels. If the server involves the use of cookies, then when you visit this site the next time only selected channels will be displayed. In fact, the possibilities are much wider, but their review is beyond the scope of the article.
, , , « cookies?». , . , , . , , cookies , , . , .
, cookies, , - , . . .
« cookies?» . : , , .
Opera, , cookies, : Ctrl+F12, «» «Cookies». , .
Firefox : – . « » .
Windows Internet Explorer «», .
Google Chrome , , , .
, cookies. . – CCleaner. «» . , , . , . reg- : , .