Tongues (glossolalia) is one of the most common spiritual gifts and is often the first gift given. Tongues is a gift of prayer in a different language—the language of the Holy Spirit. Those praying in tongues do not know what they are saying, only that they are praising God. “In the same way, the Spirit too comes to the aid of our weakness; for we do not know how to pray as we ought, but the Spirit itself intercedes with inexpressible groanings.” (Romans 8:26).
Interpretation of Tongues is the charism of interpreting some tongues (not translating) for the sake of giving a message to the group. It is the phenomenon of speaking publicly in tongues and having someone else understand and express the meaning of tongues.