A "blackjack bot" is an automated software designed to play blackjack by using algorithms, often mimicking or improving upon human decision-making, including applying strategies like card counting. While such bots can technically be used in online blackjack, most online casinos explicitly prohibit them in their terms of service. Casinos have sophisticated systems in place to detect bot use, and players caught using one can face account suspensions or bans. Additionally, using a bot raises legal and ethical concerns, as it gives an unfair advantage and disrupts the integrity of the game. Therefore, while it’s technically possible, using a blackjack bot in online play is both risky and generally considered against the rules.