A dwarf irregular galaxy is a small, irregularly shaped galaxy that lacks a defined structure. These galaxies are typically less than a few billion solar masses and can contain a mix of young and old stars. They often have a chaotic appearance, with regions of active star formation and areas that are more sparsely populated. Dwarf irregulars are important for studying galaxy formation and evolution. They are often found near larger galaxies, such as the Milky Way, and can be influenced by their gravitational pull. Their irregular shapes and star formation activity provide insights into the processes that shape galaxies over time.