It is an open source smart contract wallet running on Fantom network, enabling the multi-signature of your crypto assets or interactions with other smart contracts. That means, it is suitable for managing funds in teams. You can set owners of the safe and a minimum number of people to approve a transaction before it can execute. This is different from a single key wallet, often referred to as an externally owned account (EOA), where a single person owns the private key and approves transactions with it.
Fantom Safe supports FTM and ERC20 (Tokens on Fantom network), which you can transfer to the safe in a usual way, how you are used to from standard account transfer. You can see the fiat values of your assets on your dashboard and easily send funds from it away.
Multisig web application is deployed on these locations:
https://safe.fantom.network for Fantom mainnet
https://safe.testnet.fantom.network for Fantom testnet
As Fantom Safe is based on Gnosis Safe, you can use their guidelines for creating a safe and managing transactions. They did a really great job and all the actions are well explained in their web pages Getting Started