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There are multiple types of Port Expanders including, but not limited to USB Expanders, HDMI Expanders, FireWire Expanders, and 15 Pin VGA Expanders. Port Expanders are used for the benefit of having multiple ports instead of being limited to only two or three. A Port Expander has Advantages, and disadvantages that a lot of people are not aware of for example, a advantage would be that you can connect multiple devices to benefit your need at the time, and the situation you are in. A disadvantage on the other hand is if you have too many ports plugged in at once your computer can start to run at a slower speed then you are accustomed to, and hinder your performance. Below are some pictures of the various ports.
USB Port Expander
HDMI Port Expander 15 Pin VGA Port Expander

FireWire Port Expander

There are also two basic types of port expanders, there is Internal which is not seen due to the fact that is inside of the motherboard, and the only part that you can see is the Expansion Plate, and that is where you can connect to only two or three USB ports. The external is when you connect the port expander, and get multiple ports that you can connect too. The big question with port expanders that a lot of people ask is that are there specific port expanders that you need to buy for your type of computer? And the answer is no port expanders are generic, and can be used for any type of computer you own.

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