The meeting and combining of waves is called interference. Interference occurs when two or more waves meet at a point and interact with each other, resulting in a new pattern of waves. The type of interference that occurs depends on the phase difference between the waves. If the waves are in phase, they will interfere constructively, resulting in a wave with a larger amplitude. If the waves are out of phase, they will interfere destructively, resulting in a wave with a smaller amplitude or even no wave at all.