Hawking Radiation
Hawking radiation is the slow release of energy that causes black holes to shrink and fade away over time.
Think of it this way
A sealed jar sits on a counter, losing tiny drops through a small crack. Each drop forms at the jar's edge — one slips out and one falls back in. Over a very long time, the jar empties and fades away. A black hole loses energy the same way until it shrinks and is gone.
Explaining hawking radiation by grade level
A black hole pulls in everything around it. But tiny bits of energy still escape from its edge. Over a very long time, the black hole gets smaller and smaller. It loses so much that one day it is gone.