Banks are businesses that take deposits, lend money, and provide payment services

A bank is a licensed financial institution that holds money on your behalf, lends it to other people and businesses, and processes payments like checks and transfers. When you deposit money into a bank account, the bank becomes responsible for keeping that money safe and returning it when you ask for it. In exchange, the bank uses your deposits to make loans to other customers—and keeps the difference between what it pays you in interest and what it charges borrowers as profit.

Banks are regulated by federal and state governments to protect your money. The Federal Deposit Insurance Corporation (FDIC) insures deposits up to $250,000 per account holder per bank, meaning if the bank fails, the government will return your money. This protection is automatic—you do not need to sign up for it.

Key Takeaways

  • Banks hold your deposits, lend money to borrowers, and process payments like transfers and checks.
  • The FDIC insures deposits up to $250,000 per person per bank if the bank fails.
  • Banks make money by charging interest on loans and paying lower interest on savings accounts.
  • Different types of banks—commercial banks, credit unions, and online banks—offer different services and fee structures.
  • Your money in a bank account is not the same as cash under your mattress; the bank invests it and takes on risk.

How banks make money from your deposits

When you deposit $1,000 into a savings account, the bank does not lock that money in a vault with your name on it. Instead, the bank lends most of that money to other customers—a homebuyer, a small business, a car buyer. The bank pays you a small interest rate (often less than 1 percent per year on savings accounts) and charges borrowers a much higher rate (5 to 10 percent or more on mortgages and car loans). The difference is the bank's profit.

This system works because not every depositor withdraws their money at the same time. The bank keeps a reserve of cash on hand to cover daily withdrawals, but most deposits are out in the world as loans. If a bank makes bad loans—lending to people who do not repay—it can run out of money and fail. That is why regulators require banks to hold a minimum amount of capital and to report their lending practices regularly.

Types of banks and how they differ

Commercial banks are the most common type. They offer checking accounts, savings accounts, loans, and credit cards to individuals and businesses. Examples include Chase, Bank of America, and Wells Fargo. They typically have physical branches and ATMs, though many also offer online banking.

Credit unions are member-owned cooperatives rather than profit-driven corporations. They often charge lower fees and pay higher interest on savings, but membership is usually limited to people who work in a certain industry, live in a certain area, or belong to a certain organization. Credit union deposits are also FDIC-insured up to $250,000.

Online banks have no physical branches and operate entirely through websites and mobile apps. They typically offer higher interest rates on savings because they have lower overhead costs. Examples include Ally, Marcus, and Discover Bank. Online bank deposits are FDIC-insured the same way as traditional banks.

Investment banks and brokerage firms are different from deposit banks. They do not take regular deposits or offer checking accounts. Instead, they help businesses raise money, manage investments, and trade securities. If you have a brokerage account, your money is not FDIC-insured—it is protected by different rules called SIPC coverage.

What happens when you open a bank account

When you open a checking or savings account, you sign an agreement that spells out the bank's rules: what fees they charge, what interest they pay, and what happens if you overdraw your account. The bank will ask for identification and a Social Security number to verify who you are and to comply with federal anti-money-laundering laws.

Once your account is open, you can deposit money by visiting a branch, using an ATM, or transferring funds electronically. The bank assigns you an account number and a routing number (a code that identifies the bank). You use these numbers to receive direct deposits, set up automatic payments, and transfer money to other banks.

Bank fees and how they reduce your returns

Banks charge fees for services and for mistakes. Common fees include monthly maintenance fees (often $10 to $15), overdraft fees (charged when you spend more than you have, typically $30 to $35 per transaction), ATM fees (if you use another bank's ATM), and wire transfer fees. Some banks waive monthly fees if you maintain a minimum balance or set up direct deposit.

These fees reduce the value of your deposits. If your savings account earns 0.5 percent interest per year but you pay a $12 annual maintenance fee, that fee wipes out most of your earnings. Online banks and credit unions often charge lower fees because they have fewer costs to cover.

How banks protect your money and what can go wrong

Banks use multiple layers of security to protect deposits. They keep records of every transaction, use encryption to protect online banking, and require passwords or biometric authentication to access accounts. If someone steals your debit card or hacks your account, federal law limits your liability to $50 if you report the fraud within 60 days.

Bank failures are rare in the United States because of regulation and FDIC insurance. The last major wave of bank failures happened during the 2008 financial crisis. If a bank does fail, the FDIC takes over and either sells the bank to another institution or pays out deposits directly. In most cases, you can access your money within a few business days.

The main risk to your money is not bank failure—it is inflation. If your savings account earns 0.5 percent interest but inflation is 3 percent, your money is losing purchasing power. Over time, you can buy less with the same amount of money. This is why some people keep emergency savings in a bank (for safety) but invest longer-term money in stocks or bonds (for growth).

How banks process payments and transfers

When you write a check, the recipient deposits it at their bank. That bank sends the check through a clearing system (run by the Federal Reserve or private processors) to your bank, which verifies the funds and deducts the amount from your account. This process typically takes 1 to 3 business days, which is why checks are slower than electronic payments.

Electronic transfers are faster. An ACH transfer (Automated Clearing House) moves money between banks and usually takes 1 to 2 business days. A wire transfer moves money the same day or next business day but costs $15 to $50. A debit card transaction is processed instantly at the point of sale, though the bank may not deduct the funds from your account until the next day.

Banks also offer bill pay services that let you schedule payments to utilities, landlords, and other payees. The bank either sends a check or an electronic payment on the date you choose. This is useful for setting up automatic payments so you do not miss due dates.

Frequently Asked Questions

What is the difference between a bank and a credit union?

Credit unions are member-owned and typically offer lower fees and higher interest rates. Banks are profit-driven corporations. Both are insured by the FDIC up to $250,000. Credit unions often have stricter membership rules—you may need to work in a certain field or live in a certain area to join.

Is my money safe in a bank?

Your deposits are insured up to $250,000 per person per bank by the FDIC. If the bank fails, the government will return your money. If someone steals your debit card or hacks your account, federal law limits your liability to $50 if you report it within 60 days. The main risk is inflation eroding the value of your savings over time.

Why do banks charge so many fees?

Banks charge fees to cover operating costs and to generate profit. Overdraft fees, ATM fees, and maintenance fees are common. Online banks and credit unions often charge lower fees because they have fewer physical locations and staff. You can reduce fees by choosing a bank with low charges, maintaining a minimum balance, or using direct deposit.

How long does a bank transfer take?

ACH transfers between banks take 1 to 2 business days. Wire transfers take the same day or next business day but cost more. Checks take 1 to 3 business days to clear. Debit card transactions are processed instantly, though the bank may not deduct funds from your account until the next day.

What happens if a bank fails?

The FDIC takes over and either sells the bank to another institution or pays out deposits directly. In most cases, you can access your money within a few business days. Your deposits are insured up to $250,000, so you will not lose money if the bank fails.