Hearthstone is a free-to-play online digital collectible card game developed and published by Blizzard Entertainment. The game is set in the Warcraft universe, and players collect cards based on characters, spells, and other elements from the game.

The gameplay of Hearthstone is similar to other collectible card games, with players using decks of cards to battle against each other. Each player starts with a set amount of health and a deck of cards, which they draw from each turn. Players must use strategy and tactical decision-making to outsmart their opponents and take down their health to zero.

One of the unique features of Hearthstone is its use of hero classes, which have their own special abilities and sets of cards. Players can build their own custom decks by collecting cards through play or purchasing them through microtransactions.

In addition to its competitive gameplay, Hearthstone also features a single-player adventure mode and a rotating set of events and challenges for players to participate in. With its immersive gameplay and vibrant community, Hearthstone has become a popular title in the world of online gaming.