What is being born again?

Jesus spoke to Nicodemus that for a person to enter the kingdom of God they must be born again. (John3:1-8) This experience occurs when a person is baptised by full immersion in water and baptised in the Holy Spirit. The evidence of a person being born again of the Holy Spirit is the sound or voice of the Spirt. On the Day of Pentecost, the faithful believers had this experience which was individually evidenced in them by speaking in tongues. (Acts2:1-4)