What is a "typhoon" and what are its characteristics?

These circles with different colors in the typhoon track map represent the wind ranges of different wind levels: the outermost circle is a strong wind range of magnitude 7, the second circle is a strong wind range of magnitude 10, and the third circle is a strong wind range of magnitude 12.

Typhoon (English: Typhoon) is a tropical cyclone. Tropical cyclone is a low-pressure vortex that occurs on the surface of tropical or subtropical ocean, and it is a powerful and profound "tropical weather system". In China, tropical cyclones in the South China Sea and the Northwest Pacific are divided into six grades according to the maximum average wind speed near the center of the bottom layer, and those whose wind reaches 12 or above are collectively called typhoons.

Meteorologically, according to the definition of the World Meteorological Organization, the sustained wind force at the center of a tropical cyclone reaches 12 (that is, more than 64 knots, more than 32.7 meters per second, or more than 1 18 kilometers per hour), which is called a hurricane or other similar words (typhoon in the northwest Pacific). "Typhoon" and "hurricane" are both tropical cyclones, but they happen in different places and have different names.