What is an Evercookie?
As explained by the article on technologies supported by WebCookies.org there are many techniques to store data in user's browser. Websites would use HTTP cookies set using
document.cookies property, HTML4
sessionStorage, Adobe Flash storage and even more exotic technologies. A supercookie is a term coined by Samy Kamkar who designed software that uses all of these techniques to store a piece information that is almost always guaranteed to be somehow stored in user's browser despite