Difference between Prompt Table with No Edit and Prompt Table with Edit?

Prompt Table with No Edit:
                                           Provides users with a list of suggested values, but does not edit the contents of the  field against the prompt table. Users can enter any value.

Prompt Table Edit:
                                 Edits the contents of the field against the values that are maintained in the specified prompt table. Selecting this option activates the Prompt Table field.