List and describe four types of computer files?

The types of file formats found on computers ranges into the hundreds, if not thousands. Specific types of files such as documents, webpages, graphics and photos all have their own file formats with varying extensions depending on the program used to create, open or view each individual type of file. A few common file formats for documents are: .doc, .docx, .txt and .pdf. A few common file formats for graphics or photos are .jpeg, .gif, .png, .eps and .tiff.