In John, denotes the essential Word of God, Jesus Christ, the personal wisdom and power in union with God, his minister in creation and government of the universe, the cause of all the world's life both physical and ethical, which for the procurement of man's salvation put on human nature in the person of Jesus the Messiah, the second person in the Godhead, and shone forth conspicuously from His words and deeds.

A Greek philosopher named Heraclitus first used the term Logos around 600 B.C. to designate the divine reason or plan which coordinates a changing universe. This word was well suited to John's purpose in John 1. (Strong's Concordance)