A tornado is a super strong wind being a natural disaster that wipes away all houses and the only way to protect yourself from one is to hide in a cellar, and underground trapdoor that will keep you from getting blown away. It's like a vortex of wind that spins like a black hole except it's not in space, it doesn't tear things apart INTO ATOMS, and it doesn't suck EVERYTHING up like it won't suck light up but black holes do.
when a high pressure region is surrounded on all sides by a low pressure region then winds from all sides try to move inward( as winds always blow from high pressure to low pressure) so a circular motion of winds is created it is called a cyclone.
I believe tornadoes, typhoons, hurricanes etc are classified on intensity and whether water is involved with the cyclone.
Its basically a tube of rapidly swirling or 'twisting' air caused by the right mix of warm air, cold air and moisture in the atmosphere. When it gets twisting fast enough and the air currents are right it goes from horizontal to vertical and becomes a tornado.