DeFi functions securely because of three unified systems: Blockchain, Private Wallets, and **Smart Contracts**.
### Smart Contracts: The Digital Bankers
A smart contract is an open-source, automated program hosted directly on the blockchain ledger. It automatically executes agreements once specific, predefined conditions are satisfied.
### Comparative Example: The Loan
– **Traditional Bank:** You submit documents to bank managers, complete credit checks, wait weeks for manual analysis, and rely on arbitrary human approvals.
– **Smart Contract System:** The code automatically approves and releases the loan instantly if you supply the required collateral on-chain.
No human administrative approvals, no credit bias, and no bank office processing is required.