What is the primary function of the "SUM" function in Excel?

The primary function of the "SUM" function in Excel is to calculate the total sum of a specified range of cells. This function adds together all the numerical values within the defined range, providing a straightforward way to aggregate data efficiently. For instance, if you have a list of sales figures in a column, using the SUM function can quickly provide the total sales amount without the need for manual calculations.

The simplicity and efficiency of the SUM function make it one of the most commonly used functions in Excel for data analysis and financial calculations, allowing users to derive important insights from their data sets with ease.