add third party cookie explenation

Author: or3stis

README.md

@@ -1128,7 +1128,7 @@ All Web Browsers retain certain information about our browsing habits. That info
 
 Since Web Browsers execute untrusted code from the server, it is important to understand what type of information can be accessed. The [Navigator](https://developer.mozilla.org/en-US/docs/Web/API/Navigator) interface gives access to information about the Web Browsers user agent. Those include information such as the operating system, Websites' permissions, and the device's battery level. For more information about security conscious browsing and what type of information is being "leaked" by your browser, see [HowTo: Privacy & Security Conscious Browsing](https://gist.github.com/atcuno/3425484ac5cce5298932), [browserleaks.com](https://www.browserleaks.com/) and [EFF Panopticlick](https://panopticlick.eff.org/).
 
-Disable third-party cookies from your Web Browser settings.
+To hinder third party trackers, it is recommended to disable third-party cookies from your Web Browser settings. A third party cookie is a cookie associated with a file requested by different domain than the one the user is currently viewing. Most of the time third party are used to create browsing profiles by tracking a user's movement in the web. Disabling third-party cookies prevents HTTP responses and scripts from other domains from setting cookies. Moreover, cookies are removed from requests to domains that are not the document origin domain, so cookies are only sent to the current site that is being viewed.
 
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