Private Key
A secret number proving ownership of a crypto address — never share it.
A private key is a cryptographic number unique to each crypto address. Whoever has the private key can sign transactions and spend funds from that address — no password, no bank, no recovery.
A private key is typically a 256-bit number displayed as 64 hexadecimal characters. A seed phrase is just an easier way to store and recover the private key.
Golden rule: a private key that has been seen online is compromised. Generate wallets offline or on trusted hardware. Never enter a private key into web forms or apps you don't control.