Iframe means html tag, using which you open a another website page or your own another page within the same page, giving specific width and hight, so basically opening another page within a page using that code is called iframe
The iframe is an html document embedded inside another html document on a website. It is often used to insert content from another source, such as an advertisement, into a web page. Although an iframe behaves like an inline image, it can be configured with its own scrollbar independent of the surrounding page's scrollbar.