Hi pupil here's your answer ::
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They are needed because of the following reasons :
》The storage capacity of primary memory is limited.
》 Primary memory (RAM) is volatile in nature.
》 RAM is not portable memory.
》 RAM chips are expensive. Increasing RAM will increase the price of the computer.
So, for the above reasons we need to use the Secondary memory devices.
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Hope this helps . . . . .
Answer:
An extranet is a private network that uses Internet technology and the public telecommunication system to securely share part of a business's information or operations with suppliers, vendors, partners, customers, or other businesses.
Someone can install an operating system by disk or removable storage media.
Disk being floppy, tape or commonly a DVD.
Removable storage being a USBdrive.