**Difference between formula and function in Excel:**

**Formulas:** A formula is an expression that operates on values in a range of cells or a cell.

For example, =A1+A2+A3, which finds the sum of the range of values from cell A1 to cell A3.

**Functions:** A functions are predefined formulas in Excel. They eliminate laborious manual entry of formulas while giving them human-friendly names. For example: =SUM(A1:A3). The function sums all the values from A1 to A3.