Answer Description
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.
Wikipedia
Traffic shaping is a bandwidth management technique used on computer networks which delays some or all datagrams to bring them into compliance with a desired traffic profile Traffic shaping is used to optimize or guarantee performance, improve latency, or increase usable bandwidth for some kinds of packets by delaying other kinds It is often confused with traffic policing, the distinct but related practice of packet dropping and packet markingThe most common type of traffic shaping is application-based traffic shaping In application-based traffic shaping, fingerprinting tools are first used to identify applications of interest, which are then subject to shaping policies
Traffic_shaping - Wikipedia, the free encyclopedia