The AdS/CFT correspondence is a theoretical framework in physics that suggests a relationship between two types of theories: Anti-de Sitter space (AdS), which is a model of gravity, and Conformal Field Theory (CFT), which describes particle physics without gravity. This correspondence implies that a gravitational theory in a higher-dimensional space can be equivalent to a quantum field theory on its lower-dimensional boundary. This idea helps physicists understand complex phenomena in quantum gravity and has implications for various fields, including string theory and black hole physics. The correspondence provides insights into how gravity and quantum mechanics might be unified.