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If you drop a rock into a lake, the whole surface of the water becomes the wavefield as the water wave propagates. Each circle around the center where the wave starts is a wavefront. A wavefront is an interface (a straight line, a plane, a circle (as in this case)) or a ball, etc in the wavefield, over which a wave has a constant phase. For example, a wavefront could be the circle over which the wave has a maximum (the crest of a water wave) or a minimum (the trough of a water wave) value. For another example, if you have a plane wave, a wave front is a plane perpendicular to the wave propagation direction where the wave has the same phase over the whole plane.