The Susskind conjecture is a theoretical idea in the field of string theory and quantum gravity, proposed by physicist Leonard Susskind. It suggests that the information contained within a black hole is not lost but rather encoded on its surface, known as the event horizon. This idea challenges the traditional view of black holes, which posited that information could be irretrievably lost. This conjecture is closely related to the holographic principle, which posits that all the information in a volume of space can be represented as a theory on its boundary. The Susskind conjecture aims to reconcile the laws of quantum mechanics with the behavior of black holes, contributing to our understanding of the universe.