What is different between Internet, intranet, and extranet?

What is different between Internet, intranet, and extranet?
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Apologize for any grammar mistakes. Internet is a term used for global information network as a whole and is not really relevant to other two terms. To speak about specifics we have intranet and extranet as detailed below: Intranet is like your office network or home/school where you will be having several broadcast clients within the area limit or sometimes it could be just one. Extranet is  like a broader term refers to a network of computers utilized by one big organization, outside of one local network,. This is often connected by VPN and would include satellite offices and teleworkers.
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