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In Unity, the Animation Curve is utilized to visually represent and edit both the timing and value of keyframes. This tool provides a graph-like interface where the X-axis typically represents time, while the Y-axis reflects the value of the property being animated. By manipulating the curve, developers can create smooth transitions, adjust the interpolation between keyframes, and fine-tune animations to achieve the desired effect.

The Animation Curve is essential for controlling how properties change over time, such as position, rotation, or scale, allowing artists and designers to craft animations that feel natural and responsive. By adding and adjusting keyframes along the curve, it's possible to produce a wide range of motion that can enhance the overall game's visual appeal. This makes Animation Curves a fundamental element in the process of animation creation within Unity.

Other options, such as Timeline Layer and Marker Indicator, have distinct functions related to organization and sequencing of clips but do not primarily serve the purpose of directly editing keyframe values and timing in a visual manner. A Behavior Tree, while useful for defining AI behaviors, also does not pertain to the editing of animations or keyframe data.