Imagine you live in a prosperous country, with a lovely climate, beautiful beaches, blue seas. But there's something funny about this country. It doesn't have a functioning banking system.
You can put money into your bank, but you can't get it out again. At least you can, through ATMs, but only in very small amounts.
If you have money on deposit, you can't take the money out and close the account. And if it's a time deposit, when it reaches the end of its life, you can't have the money to spend. You have to roll it over into a new deposit.
You can't cash a cheque in a high street bank. You can't pay bills in a high street bank, either. And no high street bank is lending any money, so if you want a loan, forget it. In fact high street banks are not much use.
Your employer pays you in cash, because there are no electronic payments. Which is just as well, really, because you need cash. There are no automated payments such as direct debits, so you pay all your household bills in cash. Credit and debit cards are no longer accepted anywhere, so you buy all your shopping and petrol for your car with cash. You can't make phone or internet purchases.
If you have more than one account, you can't transfer money between your accounts. If only one of your accounts has ATM access, once that account is empty, you are stuck with no money.