In essence, finance is the art and science of watching the money flowing into and out of the business, then deciding how to allocate it and determining whether or not what you are doing is producing the results you want.
Every business that want to be successful, must bring in a certain amount of money to keep the business going. If you are creating value, marketing, selling and delivering Value, there is money flowing into and out of the business everyday. In order to continue operating, every business must bring in sufficient revenue to justify all of the time and effort that goes into running it.
The best businesses create a virtuous cycle: they create huge amounts of value while keeping their expenses consistently low, so they make more than enough money to keep going without capturing too much value. Finance helps you watch your money in a way that makes sense.