Salvation is moving spiritually from being separated from God to being in a right relationship with Him.  It is not about just asking Jesus into your heart and then going out and living your life as you please.  It is about finding your identity in Christ that results in you moving from spiritual death into spiritual life.

You can read more about the meaning of salvation in Acts 4:12; 2 Timothy 1:9; Titus 2:11-12; Ephesians 2:8-10.