ITER, meaning the way in Latin is the acronym for International Thermonuclear Experimental Reactor. ITER is a step towards future production of electricity from fusion energy. ITER will produce at least ten times more thermal energy than the energy required to operate it, which can be converted to electricity in future power producing reactors based on fusion.

An unprecedented international scientific and technological collaboration representing more than half the worlds human population is presently involved towards construction of ITER. The ITER partners are presently the People's Republic of China, the European Union, India, Japan, the Republic of Korea, the Russian Federation and the United States of America.