Which feature in Premiere Pro allows you to animate changes in effects over time?

Keyframing is a powerful feature in Premiere Pro that enables you to animate changes in effects over time. It allows you to set specific points, known as keyframes, at which values for various parameters can be specified. For example, you can animate the opacity of a clip, changing it from fully transparent to fully visible by placing keyframes at the start and end points of a transition.

When you set keyframes, Premiere Pro interpolates the values between them, creating a smooth transition over the duration defined. This functionality is essential for achieving dynamic effects like zooming in or out, changing color saturation, and adjusting audio levels, among other possibilities.

In contrast, splitting involves dividing a clip into segments, rendering is about processing effects and generating the final output, and trimming focuses on adjusting the in and out points of a clip to control its duration. These functions do not enable the animation of effects over time like keyframing does.