Explain the concept of expressions in After Effects and provide an example of their practical use.

Expressions in After Effects are a powerful feature that allows users to create dynamic and automated animations by writing scripts or mathematical expressions that control the properties of layers and compositions. They provide a way to link, manipulate, and automate values, enabling complex animations and interactions beyond what can be achieved with traditional keyframes. Let's explore the concept of expressions in more detail and provide an example of their practical use: Expressions are essentially snippets of code or mathematical formulas that are written in a scripting language called JavaScript. They can be applied to various properties within After Effects, such as position, scale, opacity, rotation, and even effects parameters. Expressions are evaluated by After Effects in real-time, providing a dynamic and responsive animation experience. The ....