A prophet was someone in the Old Testament who spoke for God. In Deuteronomy 18:18 God told Moses, I will send them a prophet like you. This prophet will be one of their own people. I will tell him what he must say, and he will tell the people everything I command. God did not give us the Holy Spirit until after Jesus, so he spoke to people through the prophets before that. Sometimes they foretold the future but this wasn't always the case. Women could be prophets as well - Miriam, Deborah and Hulda are three we now of from the Bible. Some significant prophets include Moses, Jeremiah, Samuel, Isaiah, John the Baptist and Jesus.
The New Testament speaks of the gift of prophecy which is different to being a prophet. In 1 Corinthians 14:1 Paul said, Be eager to have the gifts that come from the Holy Spirit, especially the gift of prophecy. A prophecy is a revelation of God. All believers can receive a prophecy or revelation from God because his Spirit lives in us. My understanding is that the gift of prophecy involves sharing a revelation from God, something that has been revealed to you by the Holy Spirit. Any prophecy must line up with God's word, otherwise it is false.
Short and sweet inspirations for Christian teen girls.