The "Path Integral" is a concept in quantum mechanics developed by physicist Richard Feynman. It describes how particles, like electrons, can take multiple paths simultaneously when moving from one point to another. Instead of following a single trajectory, the particle's behavior is represented as a sum of all possible paths, each weighted by a probability amplitude. This approach allows for a more comprehensive understanding of quantum phenomena, as it incorporates the principles of superposition and interference. The path integral formulation is essential in various fields, including quantum field theory and statistical mechanics, providing a powerful tool for analyzing complex systems.