Evercookie is a javascript API and it creates a very sticky (my own words) permanent cookie
its purpose is to detect a client even if the user deletes their cookies, the cookie it creates for this purpose
If the user deletes the (cookies) it instantly recreates it and uses the following ways during this rebuild:
At the moment, the only thing that can stop this sticky cookie is the Private Browsing mode of safari, there are also plugins like Noscript and FlashBlocjk in Firefox.

Let’s say someone uses Firefox and ate the evercookie, then started using internet explorer, in this case as long as they continue to use the Local Shared Object cookie (which everyone is using), the cookie instantly generates itself in internet explorer , A question may come to your mind, whether the user needs to set something up to eat this cookie (evercookie), here is the striking part: NO, he is aware of what is going on. It will not be with , it is enough to visit a page that uses this cookie , check the following page to learn the source code and how to use it :
https://samy.pl/evercookie/
It is certain that advertisers or those who want to steal your personal information will use this cookie a lot soon, of course, we should not deal with the bad side only, for example, a good side came to my mind; Let’s say a member of your website or form is inconvenienced and even if you throw an IP range ban, he changes the ip and becomes a member again and disturbs the people. If you use the method called cookie ban, he will delete his cookies and do it again, but what if the above method is used? No matter what he does this time, he will not be able to escape.