You experienced what the Bible calls in First Corinthians 12, two of the nine spiritual gifts that are mentioned. The first was tongues and the second was the interpretation of tongues. This is explained further in First Corinthians 14. Basically, it is the manifestation of the Holy Spirit bringing a message to the people that were present. The speaking in tongues is a sign to any unbelievers and the interpretation or prophesying is speaking forth the message that God had for the believers that were present.