A Packer Shaper is a device that optimizes network traffic, often by giving priority of some types over others. This is similar to Quality of Service (QoS) and traffic policing. A Load Balancer does not prioritize traffic but instead distributes it among multiple common servers. For example, a Load Balancer would be used to distribute traffic between multiple web servers serving the same web site. A Packet Shaper would manipulate all traffic entering or leaving a network.