They are a snapshot of a firm's finances at a fixed point in time
They show the value of all the business' assets (the things that belong to the business, including cash in the bank) and all its liabilities (the money the business owes)
They show the value of all the capital (the money invested in the business), and the source of that capital (e.g. loans, shares or retained profits) so they show where the money's come from as well as what's being done with it
Debts which need to be paid off within a year, e.g. overdrafts, taxes due to be paid, payables (money owed to creditors), dividends due to be paid to shareholders
Ideally, every debt owed by debtors to the business would be paid. Unfortunately, the real world isn't like that. Most debts get paid eventually, but some debtors default on their payments they don't pay up.
It's important to be realistic about bad debts. The business shouldn't be over-optimistic and report debts as assets when they're unlikely to ever be paid. On the other hand, they shouldn't be too cautious and write debts off as bad debts when they could make the debtors pay up.
Businesses need just enough cash to pay short-term debts, but not too much as spare cash is great at paying off debts but lousy at earning money for the business