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An intranet is shared content accessed by members within a single organization.An extranet is shared content accessed by groups through cross-enterprise boundaries.The Internet is global communication accessed through the Web.

HyperText Markup Language (HTML) is the standard markup language for creating web pages and web applications. With Cascading Style Sheets

It’s all about Pagerank and Pagerank is all about SEO. A website which has a very good SEO, the site will grow faster because its PageRank will be the 1st on google page ranking.