A dry run is a trial or practice run of a process or event before it actually takes place. Other synonyms for a dry run include a rehearsal, a test run, a dress rehearsal, a mock-up, a trial, a run-through, and a simulation. All of these terms refer to practicing or testing in order to ensure that the final production or event is successful. A dry run is often used in business to prepare for a presentation or launch of a new product. It is also used in military exercises to test procedures and strategies. Overall, a dry run is an important tool for ensuring success and avoiding potential pitfalls.