Once a layer style is applied to a layer, it can be moved to other layers, or into another document. This kind of flexibility and control lets you create specific layer styles and then apply them effortlessly to other layers or move them into other documents. In most cases it would make sense to save the style in the Styles palette. However, there are those times when you will only use the style once or twice. In that instance, a quick drag and drop is the most efficient way.