What does it mean to reveal a card during a game?

Revealing a card during a game means to show it to all players for a brief time. This action is typically required by the game rules or the effects of specific cards when a player must disclose information about their hand, library, or other zones. The intent of revealing a card is to ensure transparency in the game; it allows all players to have equal access to the information regarding that card, which can affect decisions and strategy.

While the other choices describe different actions that can be taken with cards, they do not align with the specific definition of revealing. Shuffling a card back into the deck or placing it on the battlefield involves different game mechanics that do not pertain to the concept of revealing. Similarly, putting a card on top of the library is an action that does not involve showing it to other players and is therefore unrelated to the definition of revealing.