A multisig wallet requires more than one private key to approve a transaction. This means a single person can’t move funds on their own. For example, a two-of-three setup requires any two of three keyholders to sign a transaction. Multisig wallets are useful for teams and treasuries because they eliminate single points of failure that a single seed phrase creates. Solflare supports multiple wallets in one app, and you can learn how Solflare secures your keys.