A bank is a business that holds your money and lends it out

A bank is a company licensed by the government to take deposits — money you give them to hold — and lend that money to other people and businesses. When you put money in a bank account, the bank doesn't lock it in a vault with your name on it. Instead, the bank uses your money (along with everyone else's deposits) to make loans. The bank pays you a small amount of interest on your deposit as a fee for letting them use your money. They charge borrowers a higher interest rate on loans, and the difference is how the bank makes profit.

This arrangement exists because it solves a problem for three groups at once. You get a safe place to store money and earn a small return. Borrowers get access to money they need right now instead of waiting years to save it. And the bank profits from the gap between what it pays you and what it charges borrowers. The government regulates banks to make sure they don't take too much risk with depositors' money — including yours.

Key Takeaways

  • Banks hold your deposits and lend that money to borrowers, paying you interest on your balance and charging borrowers a higher rate on loans.
  • Your deposits are insured by the FDIC (Federal Deposit Insurance Corporation) up to $250,000 per account type at each bank, so your money is protected even if the bank fails.
  • Banks make money from the difference between interest paid to depositors and interest charged to borrowers, plus fees for services like overdraft protection or wire transfers.
  • Not all financial institutions are banks — credit unions, savings and loans, and fintech companies operate differently and may have different rules and protections.

How banks use your deposit

When you deposit $500 into a checking account, that money enters a pool with deposits from thousands of other customers. The bank then lends portions of that pool to people buying homes, starting businesses, or paying for education. A homebuyer might borrow $300,000 at 6% interest. The bank collects that 6% payment every month. Meanwhile, the bank might pay you 0.01% interest on your $500 — roughly 50 cents per year.

The bank keeps the difference: they collect 6% from the borrower and pay out 0.01% to you, pocketing roughly 5.99% on that particular loan. Multiply that across thousands of loans and millions of deposits, and the bank's profit becomes clear. This is why banks are selective about who they lend to — a borrower who stops paying destroys that profit margin and can create a loss.

You can withdraw your $500 whenever you want. The bank doesn't need to have your exact $500 sitting in a drawer. Instead, they rely on the fact that not everyone withdraws money on the same day. This system is called fractional reserve banking. As long as enough money flows in from new deposits and loan payments to cover daily withdrawals, the system works. If too many people try to withdraw at once — called a "run" on the bank — the bank can run out of cash, even if the loans it made are sound.

What protects your money if the bank fails

The FDIC (Federal Deposit Insurance Corporation) is a government agency that insures deposits at banks. If a bank fails, the FDIC pays depositors back up to $250,000 per account type at each bank. This means if you have $100,000 in a checking account and $100,000 in a savings account at the same bank, and the bank collapses, you receive both amounts in full because they are different account types.

FDIC insurance covers most deposit accounts: checking, savings, money market accounts, and certificates of deposit (CDs). It does not cover investment accounts, stocks, bonds, or safety deposit boxes. If you have more than $250,000 at one bank, you can protect the excess by opening accounts at different banks — each bank's FDIC coverage is separate.

Credit unions (member-owned financial institutions) are insured by the NCUA (National Credit Union Administration) with the same $250,000 limit. Not all financial companies are insured this way — online investment platforms and some fintech companies may not carry FDIC or NCUA protection, so check before depositing large sums.

The difference between banks and other financial institutions

A bank is chartered by either the federal government or a state government and must follow strict rules about lending, capital reserves, and risk. A credit union is owned by its members (customers) rather than shareholders, and typically offers lower fees and better interest rates on savings because it operates as a non-profit. Both are insured and regulated, but credit unions often serve specific communities or employee groups.

A savings and loan (also called a thrift) is similar to a bank but historically focused on mortgage lending rather than general-purpose loans. A fintech company or online-only bank may offer checking and savings accounts but is not always chartered as a traditional bank — some are partnerships with banks that handle the actual deposits. Before opening an account anywhere, check whether it carries FDIC or NCUA insurance.

What banks charge you for

Banks earn money not only from the interest gap but also from fees. Common fees include overdraft fees (charged when you spend more than your balance), monthly maintenance fees (charged just for having the account), wire transfer fees (for sending money to another bank), and ATM fees (charged by some banks when you use an ATM outside their network).

Many banks waive monthly fees if you maintain a minimum balance, set up direct deposit, or meet other conditions. Some banks charge no fees at all — these are often online-only banks with lower overhead costs. Before opening an account, ask about all possible fees so you understand what the account will cost you.

How banks decide who to lend to

Banks use your credit history — a record of whether you paid past loans and bills on time — to decide whether to lend you money and at what interest rate. If you have never borrowed before, you have no credit history, and banks may deny you or charge a higher rate because they see you as higher risk. This is one reason people new to banking sometimes start with a secured credit card or a credit-builder loan, which help you build a history.

Banks also look at your income, employment history, and existing debts. They use a credit score — a three-digit number calculated from your credit history — as a shorthand. A higher score means lower risk, so you get better interest rates. A lower score means higher risk, so you pay more or get denied.

Why banks exist and why they matter

Without banks, people with money and people who need money would have to find each other directly. A farmer needing a loan to buy seeds would have to convince a wealthy neighbor to lend. A saver with $10,000 would have to negotiate terms with each borrower. Banks solve this by acting as a middleman: they collect small deposits from many savers and bundle them into loans for borrowers. This system lets money move through the economy more efficiently.

Banks also provide a safe place to store money — safer than keeping cash at home — and a way to pay bills without handling physical currency. They create a record of your financial life, which matters when you need to prove income for a loan or apartment rental. For people new to the formal financial system, a bank account is often the first step toward building credit and accessing other financial tools.

Frequently Asked Questions

What happens to my money if the bank goes out of business?

The FDIC takes over the bank and pays you back up to $250,000 per account type. This process usually takes a few days to a few weeks. Your money is protected even if the bank made bad loans or lost money on investments — the FDIC may provide is separate from the bank's financial health.

Can a bank refuse to give me my money?

A bank can freeze your account if it suspects fraud or illegal activity, but it must notify you and usually cannot hold your money indefinitely without a court order. If you have a dispute with the bank over a transaction, you have the right to file a complaint with your state banking regulator or the FDIC.

Do I have to use a bank?

No. You can use a credit union, which operates similarly but is member-owned. Some people use prepaid cards or money transfer services instead, though these typically offer fewer protections and higher fees. A bank account is not required, but it is the most common and usually the cheapest way to store money safely.

Why do banks pay such low interest on savings?

Banks pay low interest because they can borrow your money cheaply — you have few other options for safe storage. When interest rates rise (set by the Federal Reserve), banks gradually raise savings rates because they have to compete for deposits. When rates fall, banks lower savings rates quickly because depositors have nowhere else to go.

Is my money safer in a bank or under my mattress?

A bank is safer. Cash at home can be stolen, lost in a fire, or damaged. A bank account is insured, recorded, and accessible from anywhere. The only advantage to cash is privacy — banks report large deposits to the government — but for most people, the safety and convenience of a bank account far outweigh that concern.