What is the difference between internal citations and the works cited?

internal citations are used when the source is a website, and a works cited is used for books, journals, and magazine articles.
internal citations provide the author and page number of the source, while the works cited provides all publication information.
internal citations include the website address and author, whereas the works cited provides the publisher and date of publication.
internal citations and the works cited provide exactly the same information, but they are each formatted differently.