Delta, often represented by the symbol Δ, refers to the change or difference in a particular quantity. For example, in mathematics, if you have a number and you want to know how much it has increased or decreased, you would calculate the delta. This concept is widely used in various fields, including science, finance, and engineering, to measure changes over time or between different states. In everyday life, we experience delta in many ways. For instance, when tracking the temperature change throughout the day, you might say the delta in temperature from morning to afternoon was 10 degrees. Understanding delta helps us make sense of changes, whether it's in weather patterns, stock prices, or population growth.