What Does a Bank Do?
A bank is a business built around money. When you put your money in a bank, it doesn't just sit in a drawer somewhere — the bank keeps it safe, helps it grow, and even puts it to work helping other people.
Keep It Safe
Vaults, cameras, and strong security protect your money.
Help It Grow
Banks pay you a little extra just for keeping money there.
Lend It Out
Banks loan money to others who need it right now.
Different Kinds of Bank Accounts
Not all bank accounts are built the same way. Different accounts are made for different jobs — and they usually pay different amounts of interest too.
Checking Account
Built for everyday spending. Very easy to access, but usually pays little to no interest — and some charge fees.
Regular Savings
A safe place for money you're not using right now. Pays some interest, but often not a lot.
High-Yield Savings
Usually offered by online banks. Pays much more interest than a regular savings account.
CD (Certificate of Deposit)
You leave your money in for a set time, like a year. In exchange, the rate is often even higher.
Some checking accounts charge a monthly fee just for having the account — though many banks will waive that fee if you keep a minimum balance or have money deposited regularly. There can also be an overdraft fee if you spend more money than you actually have, and sometimes an ATM fee for using a machine outside your bank's network.
It's smart to ask about fees before opening any account — an account advertised as "free checking" can still come with fine print.
In general, the less easily you can get to your money, the more interest a bank is willing to pay you for it. That's a big part of why CDs often pay more than regular savings, and why regular savings usually pay more than checking.
Keeping Your Money Safe
Banks use strong vaults, cameras, and computer security to protect the money inside them. But there's another layer of protection you can't see: in the United States, most banks are backed by something called FDIC insurance.
FDIC stands for Federal Deposit Insurance Corporation — a government agency that protects the money in your bank account, up to a certain amount, even in the rare case something went wrong at the bank. It was created in 1933 to help people trust banks again after many banks failed during the Great Depression.
That protection is part of why banks are usually a safer place for money than keeping cash hidden at home.
How Interest Makes Your Money Grow
When you keep money in a savings account, the bank pays you a little extra for letting them use it. That extra money is called interest — usually a small percentage of your balance, added to your account regularly.
Here's why the type of account matters: say you put $500 into a regular savings account paying 0.5% interest. After one year, you'd earn about $2.50. Now say that same $500 went into a high-yield savings account paying 4% interest instead — you'd earn about $20. That's about eight times as much interest, just from picking a different type of account!
Here's the part that makes savings grow even faster over time: once you've earned interest, the bank starts paying you interest on that interest too. Say you keep $500 in a 4% high-yield savings account. After one year you'd have about $520. The next year, you earn interest on the full $520 — not just your original $500 — so your balance grows a little faster each year. That's called compound interest.
Borrowing: The Other Side of Banking
Banks don't just hold onto everyone's money — they also lend a lot of it out. When someone needs money to buy a house, a car, or start a business, they can borrow it from a bank. That's called a loan.
In return for the loan, the borrower pays the bank back over time — plus interest. This time, the interest flows the opposite direction: instead of the bank paying you, you'd be paying the bank.
This is actually a big part of how banks make their own money: they pay savers a small amount of interest, lend that money out to borrowers at a slightly higher interest rate, and keep the difference.
Activity: Watch Your Money Grow
Pick a starting deposit, then add years one at a time to watch all four account types grow side by side — using today's typical real-world rates.
We cap this activity at $250,000 because that's the most the FDIC insures per account, per bank. If you ever have more than that to save, it's smart to spread it across different banks or account types so all of it stays protected.
Activity: Savings or Checking?
Banks offer different account types for different jobs. Read each example, then decide which account fits best.