With that covered, what about in the case of the wiggle expression? With a wiggle, we’re instructing the property, whether the scale, opacity, or position, to wiggle within the set parameters. An example of a script-not an expression.
![after effect expression wiggle 1 demension after effect expression wiggle 1 demension](https://i.pinimg.com/originals/fa/d0/e5/fad0e5cd7059df51a618f65032f79829.jpg)
For example, this script tells the application (the application being After Effects) to position the anchor point of this layer to the center, the right, or the top. Now, unlike a script, which tells the application to do something, an expression will inform the individual property to do something.
![after effect expression wiggle 1 demension after effect expression wiggle 1 demension](https://i.ytimg.com/vi/CrMQtVsdz0A/maxresdefault.jpg)
First, before we look at what the wiggle expression does, we must ask: What is an expression? An expression is a piece of JavaScript code that you can insert into the animated properties of your media.