What is a "total solar eclipse"?

"Total solar eclipse" means that when the moon passes through the orbit between the sun and the earth, it completely covers the sun, and because the moon is far away from the earth, it looks smaller than the sun and cannot completely cover the sun. Therefore, while blocking the sun, the edge of the sun will still show the phenomenon of annular halo. This phenomenon only occurs at a specific time and place, and usually attracts a large number of astronomy enthusiasts to observe.