Submillimeter astronomy is a branch of astronomy that focuses on observing celestial objects at wavelengths in the submillimeter range of the electromagnetic spectrum, typically between 0.1 and 1 millimeter. This field allows astronomers to study objects and phenomena that emit radiation at these wavelengths, such as cool gas and dust in interstellar space, star-forming regions, and the early universe. Submillimeter observations provide valuable insights into the physical processes that govern the formation and evolution of stars, galaxies, and the universe as a whole. Advanced telescopes and instruments, such as the Atacama Large Millimeter/submillimeter Array (ALMA) in Chile, have revolutionized submillimeter astronomy and have enabled astronomers to make groundbreaking discoveries in the field.