The term born again refers to spiritual birth (regeneration)—the Holy Spirit's act of bringing believers into God's family. Jesus used this concept of new birth when he explained salvation to Nicodemus (see John 3). This term is a wonderful metaphor of new life from God. You cannot be a Christian without a fresh beginning based on the salvation Christ brings. To be born again is a magnificent gift from God.
Blessed be the God and Father of our Lord Jesus Christ, which according to his abundant mercy hath begotten us again unto a lively hope by the resurrection of Jesus Christ from the dead,
1 Peter 1:3 KJV