For example, imagine a very long page with a lot of vertically arranged content. With a page like that, you have anchors near the beginning (at least we hope you do!) that, when clicked, take the user to the associated content. If you use animation to take the user all the way down to where the anchor points, he or she will have an impression of actually traveling the distance and will understand where that particular content is located within the page structure. If you just bluntly display the content without “traveling,” it will probably feel too abstract and perhaps a bit confusing.