Wikis vs Website

I was interested in seeing the different uses for wikis, and how useful they can be for a variety of uses. For me, I am especially interested in setting one up for a public viewing in place of a website. Our library uses our county website which is not convenient to update since it is managed elsewhere. I like the idea of being able to control, along with the staff, the content in a very user friendly, non-technical manner. I think our school is also planning to utilize wikis for parents/students to have an up-to-date place to view school happenings. Our website is not able to keep up with the changing events, but I think with the ability for all to edit within the school, we could keep things very current.