Final answer:
A radial gradient is used to fill a circle with a gradient that starts at the center and transitions toward the outer edge.
Step-by-step explanation:
To fill a circle with a gradient that starts at the center and transitions toward the outer edge, you would use a radial gradient. A radial gradient starts from a central point and gradually changes color as it moves towards the outer edge. This creates a smooth transition from one color to another, resembling a sunburst or a spotlight effect.
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