the last action or detail that completes something

an improvement or enhancement that provides a finishing detail

सुधार या संवर्धन

English Usage: The final touch in the presentation was the summary slide that tied everything together.

Hindi Usage: प्रस्तुति का अंतिम स्पर्श वह सारांश स्लाइड थी जिसने सब कुछ एक साथ जोड़ा।