How do you explain Acts 2 4 the infilling of the Holy Ghost and speaking in other tongues?

If a righteous person has a desire to speak to someone who speaks a different language, the Holy Ghost will bless the speaker with the gift to be able to speak the other persons language. This is called The Gift of Tongues. There is another gift called The Interpretation of Tongues. This is when a person speaks in their own language but the hearer hears the Words in his own language.