A hawker is an itinerant or travelling salesperson who sells goods in a public street. A hawker, generally, makes noise in advertising his product, either by crying or shouting, or by ringing of bells, or by other means. A hawker is usually required to have a license.
The following is an example of a state statute (Connecticut) defining the term:
Pursuant to Conn. Gen. Stat. § 21-36, ‘Hawker’ or ‘peddler,’ as used in this chapter, means any person, whether principal or agent, who goes from town to town or from place to place in the same town selling or bartering, or carrying for sale or barter, or exposing therefor, any goods, wares or merchandise, either on foot or from any animal or vehicle.