Ads/CFT correspondence is a theory that is used to explain different things about the universe. It is very complicated and hard to explain to someone who is 5 years old, but here is an simplified version.
Ads/CFT stands for Anti-de-Sitter/Conformal Field Theory. This is a type of theory that is used to explain the behavior of matter, energy and space in the universe. It suggests that the universe is built out of tiny pieces or particles that all work together to form larger objects and events. Ads/CFT is like a map that helps us to understand how these pieces work together.
The theory suggests that gravity, which is the force that keeps us and objects stuck to the ground, is caused by special types of particles called gravitons. These particles stretch and bend the space-time fabric that connects everything together in the universe, and this affects the way objects move.
Ads/CFT is a very complicated theory, but it can help us to better understand how the universe works.