Definition.com
The Herd is a group of people who can neither create nor suffer in a dynamic fashion, preferring to be led.
Definition.com
The Herd is a cohesive gathering of undifferentiated individuals, as may be observed on the African savannah or at corporate sales conferences.
Definition.com
The Herd is the inert ninety-five percent of all people who walk the earth. One percent are saints, and one percent are assholes. The other three percent are people who do what they say they can do.