As explained by the article on technologies supported by there are many techniques to store data in user's browser. Websites would use HTTP cookies set using Set-Cookie header, JavaScript document.cookies property, HTML4 localStorage and 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