ports of a computer and its functions
The number of ports on a computer depends on the type of computer it is. The type of ports they have--for example USB, headphone, or HDMI--also varies greatly from computer to computer.
Ports are like doors to a computer each computer has many ports. Without any open ports your computer wouldn't be able to access the internet, to find open ports you can try a portscan
aids
There is no requirement for the number of Ethernet ports on a computer. There can be 0, 1, or even 1,000 Ethernet ports.
It is an extra set of USB ports for a computer.
There's no possible answer to that. A computer can have any number of USB ports. As the above is true, it doesn't matter how many you use. You can use as much USB ports as you want on your computer.
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Ports
NoYou can open the computer up and remove the USB ports.
The unused ports on your Personal Computer are dependant on the types of ports available on the computer and the type of peripherals connected. A typical desktop computer could have the following ports occupied:VGA or DVI for displayEthernet for networkingUSB for most peripherals, such as keyboard, mouse, webcam, connection cables2.5mm jack for audioThe other ports would remain unused until something requiring them is connected, and they vary greatly depending on the type of computer.