A star-forming galaxy is a type of galaxy where new stars are actively being created. This process occurs in regions of dense gas and dust, known as molecular clouds, where gravity pulls material together. The intense pressure and temperature in these clouds lead to nuclear fusion, resulting in the birth of new stars. These galaxies are often identified by their bright, blue colors, which indicate the presence of young, hot stars. Examples of star-forming galaxies include the Milky Way and the Large Magellanic Cloud. Understanding these galaxies helps astronomers learn about the evolution of the universe and the lifecycle of stars.