Last year was very significant for old good browser cookies. For those who don’t know what cookies are: they are small chunks of data stored on users hard disk. They contain mainly simple tokens and identifiers which allow websites to still recognize us as the same user even if we leave the page and return after some time.
Most of HTTP sessions are based on cookie files. They also may contain “soft” data like user preferences and customizations, like the level of sound volume in video players or prefered font size. Cookies became very famous recently. They were even taken under the protection of the european law and every website which uses them has to inform users about the fact.