The term "Theotokos" is a Greek word meaning "God-bearer" or "Mother of God." It is used in Christian theology to refer to the Virgin Mary, the mother of Jesus Christ. This title emphasizes her role in the incarnation of Christ, affirming that she gave birth to Jesus, who is both fully divine and fully human. The title "Theotokos" was officially recognized at the Council of Ephesus in 431 AD, which affirmed the belief in the divine nature of Christ. The veneration of the Theotokos is significant in both Eastern Orthodox and Catholic traditions, highlighting her importance in the history of salvation.