Blackjack has transformed from its origins as "Vingt-et-Un" in 17th-century France to the modern game known today. Initially centered on reaching 21, it evolved in the United States with new rules, such as doubling down, and adopted the name "blackjack" due to a special payout for certain hands. The rise of card counting techniques in the late 20th century led casinos to implement measures like continuous shuffling machines to counteract player advantages. Today, blackjack remains popular, adapting to technological advancements with online formats, live dealer options, and mobile apps, while balancing tradition with innovation.