Dwarf galaxies are low mass and low luminosity galaxies, typically containing a few hundred million to a few billion stars. They are thought to be similar to the earliest galaxies that populated the universe, making them ideal for understanding the early universe. Massive black holes, sometimes called intermediate-mass black holes, are usually between 10^2 and 10^5 solar masses. A short time ago, it was not known if black holes existed in dwarf galaxies. Only a few were known of until 2013, when more than 100 dwarf galaxies with spectroscopic signatures of active galactic nuclei (AGNs, a sign of a black hole) were found by the Sloan Digital Sky Survey. In the last decade, hundreds of massive black holes in dwarf galaxies have been located and researched. These black holes are hypothesized to be remnants of the “seeds” of supermassive black holes, and their study is an important step towards understanding the evolution of supermassive black holes and their host galaxies.