What is a file name that identifies the files type and indicates the application that created the file?

A file name that identifies the file's type and indicates the application that created it typically includes a file extension, which is a suffix added to the base name of the file, preceded by a dot. For example, a file named "document.docx" indicates that it's a Microsoft Word document. The ".docx" extension specifies the file type and suggests the application used to create it. Other examples include ".xlsx" for Excel spreadsheets and ".jpg" for image files.