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Crypto
51% Attack
When one person or group controls more than half the computing power on a blockchain and can mess with transactions.
Most blockchains stay safe because attacking them is extremely expensive. Smaller coins are more at risk. The threat is why big networks like Bitcoin are considered very secure — no one has enough computers to pull it off.It's like one kid suddenly controlling the whole playground and being able to change the rules of every game.
Real world: If a group got 51% of Bitcoin's mining power, they could theoretically reverse recent transactions or stop new ones, though it would cost millions and destroy trust in the coin.
💡 51% attacks are rare on major coins, but always check a project's decentralization before investing big — more spread-out mining or staking means more safety.