Eternal is simply without beginning or end. Eternal life, therefore, is life without end. This does not refer to an endless physical life but instead an endless spiritual life.
Refer to the entry for eternity for an expanded discussion on this.
A lifelong student of the Bible, Peter DeHaan, PhD, wrote the 700-page website ABibleADay.com to encourage people to explore the Bible. His main blog and numerous books urge Christians to push past the status quo and reconsider how they practice their faith in every area of their lives.