"The flock" is a symbol of people united by the true knowledge and fulfillment of the Will of God, His Commandments, who realize the necessity, the need to obediently follow the true "Shepherd" - God and His spiritual Son Jesus Christ in everything.

"The flock" is the "Church" of Jesus Christ, the assembly of people who desire to do the Will of God, His Commandments, to live a godly, righteous life.

Negative Meaning.

"Herd" is a symbol of a people united in a sinful worldview and way of life, obediently following their chosen false religious pastors and political leaders, obediently following their false teachings, destructive ideologies.