Jessamyn West --
08dec07 - Zayed University, Dubai, UAE
A blog is a website that has regular content, updated with new posts appearing at the top. Most blogs allow some form of commenting and have a means or organization such as categories or tags. Blog software is usually free or low cost.
A wiki is a website that allows editing of the site itself by site users. There are many kinds of wiki software and they all are a little different. Wiki software is usually free or low cost.