What HTML element is used to display another file within a page?

The correct answer is the IFrame element, as it is specifically designed to embed another HTML document within the current page. The IFrame (Inline Frame) creates a separate browsing context, allowing for the inclusion of an entire webpage or another document, which can be independently scrolled and interacted with. This makes it a versatile choice for displaying content such as videos, maps, or other web pages without navigating away from the original content.

IFrames support various attributes that can control their size, border, and allow for content customization, enhancing user experience without disrupting the main page. They are widely used in modern web development for embedding external resources, such as advertisements or social media widgets.

In contrast, the Frame element is more outdated and utilized in older HTML specifications to create framesets for web layouts, which have largely fallen out of favor due to usability and accessibility concerns. The Embed and Object elements can also be used to display different types of embedded content, such as multimedia files and applications, but they do not specifically target displaying HTML documents in the same contextually relevant way that IFrames do.