The ISERROR function in Excel is a handy tool to check if a formula results in an error. Here's how to use it:

Syntax:

`=ISERROR(value)`

- value: This can be any formula, cell reference, or expression that you want to check for errors.

Steps to Use:

1. Click on the cell where you want to display the result (TRUE or FALSE).
2. Type the formula: Enter `=ISERROR(` followed by the formula or cell reference you want to evaluate within parentheses.
- For example, if your formula is in cell B2, you can enter: `=ISERROR(B2)`.
3. Close the parenthesis and press Enter.

Understanding the Result:

- TRUE: If the formula in the specified cell reference results in an error, ISERROR will return TRUE. Common errors include #DIV/0!, #N/A, #VALUE!, etc.
- FALSE: If the formula evaluates without errors and returns a valid value (number, text, etc.), ISERROR will return FALSE.

Applications:

ISERROR is often used in conjunction with other functions like IF to create more robust and error-proof formulas. Here's an example:

Imagine you have a formula in cell B2 that might return #N/A if a certain condition is not met. In cell C2, you can use the following formula:

`=IF(ISERROR(B2),"Error",B2)`

This formula will first check if the formula in B2 results in an error using ISERROR. If it does (TRUE), it displays the text "Error" in cell C2. Otherwise (FALSE), it displays the value from cell B2.

By incorporating ISERROR, you can handle potential errors gracefully and ensure your spreadsheets function smoothly.