The correct answer is option 2, Tsunami. A tsunami is a series of waves that are caused by underwater earthquakes, volcanic eruptions, or landslides. When these waves approach the shore, they can cause significant damage due to their large size and force. Tsunamis are different from other types of waves like swash, currents, and tides. Swash refers to the movement of water up the beach after a wave has broken, while currents refer to the continuous flow of water in a particular direction. Tides, on the other hand, are the regular rise and fall of sea levels caused by the gravitational pull of the moon and sun. It is important to note that tsunamis are rare but extremely dangerous natural disasters.