An "oracle" is a person or medium through whom a deity is believed to communicate. In ancient cultures, oracles were often consulted for guidance on important decisions, such as warfare or agriculture. The most famous oracle in history is the Oracle of Delphi in ancient Greece, where the priestess Pythia delivered prophecies inspired by the god Apollo. In modern contexts, the term "oracle" can also refer to a source of wise counsel or prophetic predictions. Additionally, in technology, an "oracle" may refer to a database management system, such as Oracle Database, which is used for storing and retrieving data efficiently.