By virtual we mean the simulation of scenes or images,produced by an IT system,which gives the impression of reality.
BLOGS:
Blogs are web sites that work on the same principle as a personal
diary; the author of a blog writes about their experiences and expresses their opinions on given subjects.
The author of the blog publishes the texts, or posts, periodically, and they are ordered chronologically.
WIKIS:
A wiki is a type of web site that can be adapted or corrected by participating users. In this way, its contents are constantly changing, and its users can add information whenever they like, it can also grow very rapidly.
Wikipedia:
Is an universal encyclopaedia, available in many languages. Everybody who wants can contribute with information. It is very popular and is, in fact, one of the most visited sites on the web.
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