Rate Of Change (ROC) is a measure of how quickly a quantity is changing over time. It can be expressed as a derivative in calculus or as a quotient in more elementary mathematics.The formula for rate of change is usually given as: -Rate Of Change = (Change In Quantity) / (Change In Time)For example, if a car is traveling at a speed of 60 miles per hour, the rate of change of its position is 60 miles per hour.The importance of rate of change lies in its ability to measure how quickly something is changing. This can be useful in a variety of contexts, such as evaluating the effectiveness of a new business strategy, analyzing the performance of a stock, or understanding the spread of a disease. By understanding the rate of change of a quantity, we can make predictions about how it will behave in the future and take appropriate action.