What is the distinction between a file and a folder? How is each one visually represented?

A folder can hold many different files. Each document is considered a file, then that file can be stored inside a folder. For example, if I had a folder titled Jobs then I could put any information pertaining to that folder inside of it, such as a resume, which would be considered the file. A folder is represented with the title of the folder and the picture of a folder, than when you open it you can see all of the files. The files are shown by the type of document that they are. A word document contains the word image.