When waves combine, the phenomenon is known as wave interference. Wave interference occurs when two or more waves meet at the same point in space and time, resulting in the superimposition of their amplitudes. The resulting wave pattern depends on the phase difference between the waves and can exhibit various patterns, such as constructive interference (where the amplitudes add up) or destructive interference (where the amplitudes cancel each other out).

In the case of constructive interference, the peaks of one wave align with the peaks of another wave, resulting in a wave with a higher amplitude. This leads to an enhancement or reinforcement of the wave. Conversely, in destructive interference, the peaks of one wave align with the troughs of another wave, causing the amplitudes to cancel each other out. This results in a reduction or weakening of the wave.

Wave interference is commonly observed in various physical phenomena, such as the formation of standing waves on a vibrating string, the patterns produced by double-slit experiments in optics, and the interference of radio waves in communication systems. It plays a fundamental role in understanding the behavior of waves and has important applications in fields such as acoustics, optics, and telecommunications.