A recovery seed, also known as a seed phrase, is a sequence of words used to restore access to a wallet in the event of loss or damage to the device storing the wallet. The recovery seed is generated when the wallet is created and acts as a backup to recover all of the funds stored in the wallet. This seed phrase must be kept safe and secure, as anyone with access to it can gain control of the funds stored in the wallet. The recovery seed is typically a string of 12 to 24 words that can be written down and stored offline. Some wallets also allow for the seed phrase to be encrypted for added security. Overall, the recovery seed is an essential tool for anyone looking to secure their cryptocurrency holdings.