What are the rules for playing Exploding Kittens with the "Nope" card?

In Exploding Kittens, the "Nope" card can be played at any time to cancel out another player's action or card. This can include canceling an attack card or stopping a player from stealing a card. The "Nope" card can also be used to counteract another player's "Nope" card. It cannot be used to stop an Exploding Kitten card from being drawn.