It's often accompanied by a dramatic gesture, like a flourish of the hands, to emphasize the moment.
Here are some examples of how "ta-da" might be used:
* "I finished cleaning the entire house! Ta-da!" (Announcing the completion of a task)
* "And the winner of the competition is... Ta-da! Sarah!" (Revealing the winner)
* "I've finally found my lost keys! Ta-da!" (Expressing surprise and relief)