When you add a simple DAT Field Condition with a single value, you have the option to parameterize the condition.  Parameterizing a condition allows anyone running the query to override the supplied (default) value with a new value. 

Note: Parameterization is very useful for dates. You can set up a generic query based on one date and parameterize it.  When accessing the query later, you can easily just change the date without having to edit any query conditions.

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