There may be times when you do not want a cell reference to change when filling cells. Unlike relative references, absolute references do not change when copied or filled. You can use an absolute reference to keep a row and/or column constant.
An absolute reference is designated in a formula by the addition of a dollar sign ($). It can precede the column reference (a LETTER), the row reference (a NUMBER), or both.
When writing a formula, you can press the F4 key on your keyboard to switch between relative and absolute cell references. This is an easy way to quickly insert an absolute cell reference.
Let's see how this works when applied to a worksheet
Remember, using the F4 key will switch between absolute and relative cell references