Finance is the management of large amounts of money, especially by governments or large companies. So basically it is money. UK Finance reported that £11.3bn was spent on credit cards last month. That is finance is all in one because, you store money in it like loads because you don't want to have like 5, 100 pound bills in your purse/wallet.
A financial crisis is where banks handle too much money that they lose track of where it is going and that is why people call it a financial crisis it is a money crisis. After the 2008 financial crisis people still don't know if leaving their money with banks is safe.