The afterglow of sunset refers to the afterglow of the sun still remaining in the sky after sunset, describing the evening scene after sunset.
Sunset refers to the rosy clouds in the sky the day before sunset, also known as the afterglow of sunset.
Although they all describe the scenery after sunset, their expressions are different. The afterglow of the sunset describes the afterglow of the sun in the sky, and the sunset describes the rosy clouds in the sky.