what is a wiki?

A wiki is an on line collaborative tool. There are two types of wiki: one any one can edit and another is guarded and entries are controlled and therefore take about24 hours to be added. In a wiki the pages can be changed in the order. Because there needs to be continuity there is not much room for variation, there cannot be lots of different fonts for example.
Information is put on to a page and added to a wiki.
Wikis are free, mostly they are funded by people being able to advertise on them but if it is an educational one the advertisements are not there.
Pages are linked to one another by means of hyperlinks so it does not need to be so organised, although they can be altered and re-arranged as information is focussed.(It is easier to use).
Wikis are constantly being up-dated and can be added to by any one (in the free ones, not so in the guarded ones).
There is no copyright as there is traditionally, with no ownership of materials.
Worldwide tool. Excellent for research.
A whole lot of pages like a scroll and able to flick from one page to another by hyperlinks.
Success of a wiki is that it is highly structured. Each topic has a table of topics and the name is a new page.
A blog is a step on the way to a wiki.
The best wiki is http://www.wiki.com/
Scalable means that a wiki can be added to.