Reservoir is an Escrow application built on top of the XRP Ledger.
Reservoir allows you to lock up your XRP for a specified period of time through escrow directly on the ledger. This removes the XRP from the total circulating supply for the period of time defined.
Sending your XRP to escrow is extremely secure because it is not accessible to anyone during lockup and it is not stored in an address. Escrowed XRP is stored as an object directly on the ledger which means it comes with all the benefits of the security of the blockchain. This makes your XRP much less likely to be stolen and even gives you the tools needed to re-secure a new address to route your XRP to in the event of a security breach in your personal wallets or addresses.