What does the term "range" mean in math?

According to MathisFun.com, the term "range" in math is usually used to describe the difference between the highest and lowest values of a data set. However, range can also mean all the output values of a function.

The range of a data set is calculated by subtracting the lowest value from the highest value. MathisFun.com points out that the range of a data set can be misleading if there are outliers in the data. When the term range is being used to mean all the output values of a function, it is often called the range of a function to distinguish its meaning.