Seed phrase, mnemonic phrase are all synonyms for the same thing: the access key to your wallet.
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It is timeless, unchangeable and totally unbreakable.
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The seed phrase is therefore a list of words that store all the information needed to retrieve funds from your wallet on the blockchain. The wallet software will generate a seed phrase the first time you use it. You will only have to save it in several copies in several safe places.
Thus, if you lose your phone or if it does not work anymore, you will be able to generate your wallet again by reinstalling the Klub application and using your seed phrase.
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That's why it's fundamental to keep your seed phrase in a safe place.