Semis are defined as vehicles or trailers designed to carry goods or people weighing between 3.5 and 7.5 tonnes. However, there are various synonyms for the term "semis," including "semi-trucks," "18 wheelers," and "tractor-trailers." Other slang terms, such as "big rigs" or "long haulers," are also commonly used. In different parts of the world, these vehicles are known as "articulated lorries" or "semi-trailers." Regardless of the term used, the importance of semis in transporting goods across countries cannot be overstated. They are an integral part of many industries, from transportation and logistics to construction and manufacturing.