# Vault Smart Contract

The Vault is a Bera’s interface with the Autocompounder. It is where Beras deposit and withdraw their crypto.

Vault smart contracts expose two functions: \
`function deposit(uint256 _amount) external;` \
`function withdraw(uint256 _shares) external;`

When `deposit` is called, the following will happen: `_amount` of tokens is transferred from the caller to the Vault smart contract. An appropriate amount of `_shares` will be given to the caller. `_shares` is how the Vault keeps track of how much of the deposited token belongs to each Bera. Vault will transfer the deposited tokens to the Strategy smart contract to be staked.

When `withdraw` is called, the following will happen: 

1. `_shares` are removed from the caller. 
2. The appropriate amount of tokens, based on `_shares`, will be transferred from the Vault to the caller. 
   * Tokens may be transferred from the Strategy if there are not enough funds in the Vault to cover the withdrawal.