What is a rummy in blackjack?

There is no such thing as "rummy in blackjack." Rummy and blackjack are two separate card games with different rules and objectives.

Rummy is a group of matching-card games distinguished by the goal of forming sets or runs of cards of the same rank, suits, or sequence. The most popular variations of rummy include Gin Rummy, Indian Rummy, and Canasta.

On the other hand, blackjack is a popular casino card game where players aim to have a hand value closer to 21 than the dealer without exceeding it. Players must make decisions such as hitting, standing, doubling down, or splitting their hand to beat the dealer.

While both games involve cards and some strategic thinking, they have distinct gameplay and rules.