"The Word" in this passage is translated from the Greek logos, which means "spokesman," "word," or "revelatory thought." It is a name there used for an individual Personage. But who or what is this Logos? Notice the explanation in verse 14:

"And the Word was made flesh, and dwelt among us, (and we beheld his glory, the glory as of the only begotten of the Father,) full of grace and truth."

When he was born as Jesus Christ, he was flesh and blood, materialistic, and could be seen, touched, and felt. But what was he? As God—as the Logos? That is answered in John 4:24, "God is a Spirit," and spirit is invisible. We know what was his form and shape as the human Jesus. But of what form and shape was He as the Word?

The Word, then, is a Personage who was made flesh—begotten by God, who through this later begettal became his Father. Yet at that prehistoric time of the first verse of John 1, the Word was not (yet) the Son of God. He divested himself of his glory as a Spirit divinity to be begotten as a human person. He was made God's Son, through being begotten or sired by God and born of the virgin Mary.

So here we find revealed originally two Personages. One is God. And with God in that prehistoric time was another Personage who also was God—one who later was begotten and born as Jesus Christ. But these two Personages were spirit, which is invisible to human eyes unless supernaturally manifested. Yet, at the time described in verse one, Jesus was not the Son of God, and God was not His Father.