Reverberation is a phenomenon that is caused when sound waves reflect off of surfaces, creating a series of echoes that blend together and create an ambient sound. The sound waves can reflect off walls, ceilings, and other objects in an environment and create a reverberating effect. The time it takes for the sound to be reflected and heard again is known as the reverberation time. Reverberation is an important part of the overall sound of a space, as it adds warmth and depth to the sound. Reverberation also changes depending on the size and shape of a room, as well as the materials and surfaces that the sound waves reflect off of.