In theoretical physics, "branes" are multidimensional objects that arise in string theory and related theories. The term is short for "membranes," and they can have various dimensions, such as 1-dimensional strings or 2-dimensional surfaces. Branes can exist in higher-dimensional spaces, known as bulk, and they play a crucial role in understanding the fundamental structure of the universe. Branes can interact with each other and can also be the sites of various physical phenomena, such as the formation of black holes or the dynamics of gravity. They provide a framework for exploring concepts like extra dimensions and the nature of particles, helping physicists to unify different forces and particles in a single theoretical model.