Today we reviewed for the Excel test next wednesday. We reviewed almost all of the things in excel. A function is something like average, sum, count, or anything that you use in a formula to do math. A formula is something that you can type into excel to do math (you need functions in order for the formulas to work) and something that always starts with an equal sign. To sort data, highlight the data and then go to Data and Sort. You can then choose which column to sort.