Which feature allows for smooth transitions between keyframes in Premiere Pro?

Bezier keyframes are used in Adobe Premiere Pro to create smooth transitions between keyframes. This technique allows for greater control over animation speed and acceleration, resulting in more natural movement. With Bezier keyframes, you can adjust the motion path with handles, allowing for custom easing in and out of the transitions. This functionality makes animations visually appealing and fluid, as it enables easy manipulation of how quickly or slowly an effect or motion changes over time.

In contrast, linear keyframes provide a constant speed between points, which can lead to a more mechanical and abrupt transition. Clip Effects refer to the applications of effects on clips but do not specifically relate to the transition between keyframes. Motion settings pertain to the overall parameters that can be modified for motion effects but do not directly influence the smoothness of the transitions like Bezier keyframes do. Thus, using Bezier keyframes is fundamental when aiming for polished and professional-looking animations in Premiere Pro.