An agora (αγορά), translatable as marketplace, was an essential part of an ancient Greek polis or city-state. An agora acted as a marketplace and a forum for the citizens of the polis. They arose along with the poleis after the fall of Mycenaean civilization, and were well established as a part of a city by the time of Homer (probably the 8th century BC).
The most well-known agora is the Ancient Agora of Athens. Agora Open Air Museum of Izmir  is one of the well-preserved agoras in the world.