Rounding to two significant digits in Excel is a common way to ensure that your data is displayed correctly. There are a few different ways to do this, but the most common is to use the ROUND function. This function takes two arguments: the number you want to round, and the number of decimal places you want to round to. For example, if you wanted to round the number 12.3456 to two significant digits, you would use the following formula:

```
=ROUND(12.3456,2)
```

This would return the value 12.35. You can also use the ROUND function to round to a certain number of decimal places. For example, if you wanted to round 12.3456 to two decimal places, you would use the following formula:

```
=ROUND(12.3456,2)
```

This would return the value 12.35.