The de Broglie-Bohm theory, also known as pilot-wave theory, is an interpretation of quantum mechanics that introduces the concept of a guiding wave. It suggests that particles, like electrons, have definite positions and velocities, which are influenced by a wave function. This wave function evolves according to the standard rules of quantum mechanics, but it also provides a deterministic framework for understanding particle behavior. In this theory, the wave function is not just a mathematical tool but has a physical reality. The theory was developed by Louis de Broglie and later expanded by David Bohm. It aims to resolve some of the paradoxes of quantum mechanics by providing a clearer picture of how particles move and interact.