The internal combustion engine is one of the most important inventions of all time. It was invented by German engineer Nicolaus Otto in 1876. Otto worked with a partner, Eugen Langen, to create the engine, which was the first of its kind. The engine was revolutionary for its time, as it allowed for a much more efficient and powerful source of energy than other existing types of engines. It was the basis for the modern automobile and many other forms of transportation. The engine also revolutionized industry, powering many types of machinery and providing a reliable source of power. Otto's invention was a major milestone in human history and has continued to shape the modern world in countless ways.