A parameter is a placeholder for a value or values in a mapping. You can use a mask rule parameter when you configure a Data Masking transformation object in a mapping.
Use a mask rule parameter when you do not have the source connection information. You can also use a mask rule parameter when you want to assign masking techniques to source fields when you run the
task. For example, if the source transformation object in a mapping uses a parameter, you cannot assign masking techniques when you create the mapping. After you create a mapping with a source connection, you might add additional fields to the source that you want to mask. Use a mask rule parameter when you create the mapping. You can then create multiple tasks to mask different data based on the same mapping.