"Frameset": A frame and used to organize multiple windows (frames), each frame stores a separate HTML document
"Frame": used to define a specific window (frame) in "frameset", it should be noted that this element is an empty element without an end tag, it is recommended to write "frame/"
"Noframe": used to display text for those browsers that do not support frame level "noframe" element is located inside the "frameset" element
"Iframe": The difference from "frame" is that an inline frame containing another document (that is, an inline frame) is created