The SUMIFS function in Excel is used to sum up values in a range of cells based on multiple criteria. It allows you to specify several conditions that must be met before a value is included in the sum.

For example, to find the total sales of red products in the month of January, you could use the following formula: =SUMIFS(B2:B10,A2:A10,"red",C2:C10,"Jan"),

1. B2:B10 is the range of sales values,

2. A2:A10 is the range of product colors,

3. C2:C10 is the range of dates.

This formula will return the sum of all sales values in the range B2:B10 where the corresponding cell in the range A2:A10 is "red" and the corresponding cell in the range C2:C10 is "Jan".