In Adobe After Effects, which attribute can you animate to create a fade effect?

To create a fade effect in Adobe After Effects, animating the Opacity attribute is the most effective choice. Opacity controls the transparency of a layer, which allows you to smoothly transition from fully visible to fully invisible (or vice versa). By keyframing the Opacity values, you can create a gradual fade in or fade out effect.

For example, setting the Opacity to 0% at the beginning of a layer allows it to start fully transparent, and then keyframing it to 100% will create a fade-in effect as the layer becomes fully visible over time. Conversely, starting at 100% and reducing it to 0% will result in a fade-out effect.

Other attributes like Scale, Position, and Rotation are focused on altering the size, location, and angle of layers on the canvas but do not inherently affect transparency. Therefore, while they offer considerable animation possibilities, they do not create the desired fading visual effect as effectively as the Opacity attribute.