Keyframes are important markers used in animation to define the starting and ending points of an object's motion or transformation. They are used to create smooth, fluid animations by specifying the position, rotation, scale, or other properties of an object at different points in time.
When creating an animation, you typically start by defining the keyframes for the beginning and end of the animation sequence, and then use interpolation to fill in the frames in between. The process of defining keyframes involves selecting the object or element to animate, setting its properties, and then marking the specific frame where the property change occurs.
For example, let's say you're animating a bouncing ball. You would start by setting the first keyframe with the ball on the ground, and then set another keyframe a few frames later with the ball at the peak of its bounce. You would then use interpolation to create the illusion of the ball smoothly transitioning from one keyframe to the next.
When answering this question in an interview, it's important to provide a clear and concise explanation of what keyframes are and how they are used in animations. You can also give examples of how you have used keyframes in your own animation projects, and explain the impact they had on the overall quality and effectiveness of the animation.