A port replicator is used in docking stations for laptops to increase or extend the number of ports available for use and minimise the need to plug / unplug cables when removing the laptop from a desk.
A port replicator may also allow for additional hardware such as a CD / DVD or Bluray drive for which there may not be space in the laptop.
A port replicator provides a means to connect a notebook to a power outlet and provides additional ports. A docking station provides the same function as a port replicator, but also adds secondary storage.
docking station. it does everything a port replicator does plus can add ram. i think... A docking station has all the features of a port replicator plus extra slots for adding secondary storage devices and expansion slots.
A port replicator is for quick&easily taking your laptop on the go, a dock station is to make it like a desktop computer
A port replicator provides a means to connect a notebook to a power outlet and provides additional ports. A docking station provides the same function as a port replicator, but also adds secondary storage. 6th Edition, Page 1079
Docking station...it has all the features of a port replicator plus additional slots for secondary storage, and expansion cards
A docking station
In general the function and purpose of port replicators are common across different make and models. A port replicator (sometimes also known as docking station) provides all - or even more - connections usually found on ones laptop. The main difference is, that all the cables are connected to the port replicator and not directly to the laptop which makes it easy to attach and detach the laptop.
A docking station has fewer ports.
A Docking Station
port replicator
This an HP specific port used on their laptops. It allows for the connection of a Port Replicator. Port replicators are designed to be left where you often work and give ports for a monitor, sound, network and USB where the idea is to be able to plug in one port instead of several. This specification allows for the connection of Expansion Port 3 and QuickDock replicators. The HP port replicator costs between $50 and $130 US as of Jan 2010.
A port expander, or more commonly know as a port replicator or docking station, is generally computer specific. A port replicator does not introduce new hardware, but merely a means to give the port a physical connection. The connector between the computer and the port replicator provides an electrical conduit between the device it's self and the port. There are USB port replicators, but these devices do not offer the same functionality as a true port replicator, because they are limited in speed by the USB port.