Page names on Wikipedia give an indication as to what is contained on the page. A page may be part of the actual content (such as an article, category or multimedia) or for the administration and construction of Wikipedia.
Some pages have a prefix to indicate to which Wikipedia namespace the article belongs. Article pages do not have a prefix but others may begin with "File", "Category" etc. The namespace forms part of the URL as well as being shown at the head of the page.