What they are:“Webpage” is a generic term for information viewed in a web browser that does not fit any other category.
What they give you:Potentially anything. Webpages can cover any topic. Some webpages are good sources for academic research, but most are not. Before you cite a webpage, make sure that it's a good source.
How to spot them:Don't assume that, because you found a source on the Internet, it should be cited as a webpage. Many things that are commonly called “webpages” are actually other types of sources, such as reports or reviews or magazine articles or newspaper articles.
Remember: Only if the source does not fit in any other category should you cite it as a webpage.