At odds with other galaxies, irregular galaxies do not have any recognizable structure or symmetry.
Irregulars are often associated to a big spiral galaxy, they are a kind of satellite.
This is the case of the Small and Large Magellanic Clouds, two small irregular galaxies, about 180,000 light years far from the Milky Way. They are rich in gas and dust, and are forming stars at a higher rate than spirals. They contain many young stars, of the first spectral types , that is massive-blue stars. This galaxy has a companion, M81.