The laptop docking station might plug into the port on the laptop that outputs video and sound, or it might connect with a USB cable.
If you're in need of more ports and want to add a monitor and keyboard, then you would probably want to go with an all-in-one docking station. This sort of device will contain all these devices in one unit so there's less clutter on your desk. They're not much different than using a traditional multiplexer box at work - just smaller obviously!...