Monster trucks are large vehicles with oversized tires and safety features used for entertainment purposes rather than driving on roads. They became popular in the United States in the 1970s when people began modifying trucks and holding competitions. Early competitions involved trucks battling each other by trying to destroy cars, while Australian competitions focused more on racing. Although monster trucks can be dangerous if they roll over or catch fire, their reinforced designs and driver safety equipment make them relatively safe. The author's opinion is that monster trucks should not be considered a sport due to their unpredictability and lack of clear rules for winning competitions.