Blackjack evolved from earlier card games like "Twenty-One" in 17th-century France. It spread to North America, gaining its current name in the early 20th century. The 1950s and 60s saw the development of basic strategy and card counting, revolutionizing play. Casinos responded with countermeasures like multiple decks. Later innovations included side bets and rule variations. The rise of online gambling in the 1990s and 2000s made Blackjack widely accessible, introducing digital variants and live dealer games. The game continues to evolve with technology and changing regulations, remaining one of the most popular casino games globally.