How to update a field with values from another field in table?

Hello,

I have a big dataset with a field of values ranging from 1 to 10.

I want to update another field with a string depending on which value is in the other field.

So for example:

1 = Woodland
2 = Arable
3 = River, etc etc

I was wondering how I would go about this in arcgis?

I have done something similar with SQL using an IIF function but am struggling with how to figure it out.

Thanks for any help