Am I making money? Is it worth it to continue providing this product or service? Is that ad we made last week working? There's a KPI (Key Performance Indicator) for that, and many more similar questions.
The KPI digs deeper into the numbers than that reported on your basic Accounting Statement and helps you see clearly what is working and what isn't in order to make decision making easier.
They give us an opportunity to regularly look at different aspects of your business at a point in time to give guidance as to what should be looked at closer in order to function smoothly, properly, and efficiently.