ContinuousAction

is an option for Manipulate, Slider, and related functions that specifies whether action should be taken continuously while controls are being moved.

Details

With ContinuousAction->True, continuous updates are supplied to Dynamic objects whenever the position of a control is changed.
With ContinuousAction->False, updates are supplied only when the controls are in their final position, say as determined by the release of a mouse button.
ContinuousAction->False typically gives the same behavior as Dynamic[expr, Temporary].

Create a Slider that updates only when the mouse is released:

Create an InputField that updates continuously:

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