The Great Commission is a term that refers to Matthew 28:18-20 in the Christian Bible, which describes how Jesus instructed his disciples to go spread the gospel throughout all nations. The disciples were commissioned to teach everyone about Jesus and his laws and baptize new believers.
The Great Commission is the last thing Jesus spoke about to his disciples. There is some debate between Christians as to whether Jesus was giving this commission to all Christians or just the eleven disciples he was speaking to at the time. Evangelical Christians use this commission as a basis for their work in ministry and missions, whereas more conservative Christians believe that this commission was directed solely to the eleven disciples.