Black Friday has evolved significantly since the 4home e-shop introduced it in Czechia in 2011. Originally a one-day pre-Christmas sale, it now often spans weeks or even the entire month of November, driven by competition among retailers. This extension helps merchants secure early sales while giving shoppers a chance to spread out holiday purchases, easing last-minute holiday stress. Electronics like mobile phones and TVs are the most sought-after items, alongside household appliances, toys, cosmetics, and clothing, as shoppers take advantage of extended deals.