Seed Phrase (Recovery Phrase)
Quick definition
12-24 words that can restore your entire wallet — the master backup of your keys.
Your seed phrase regenerates all the private keys in your wallet. Lose your phone? Enter the phrase on a new device and your funds reappear. Lose the phrase with no backup, and the coins may be gone forever.
Write it on paper or metal, store it offline in more than one place, and never share it — no legitimate service ever asks for it.