HTML Iframe
An HTML iframe (inline frame) is an HTML element used to embed another HTML document within the current web page. It allows developers to display content from external sources, such as videos, maps, or other web pages, seamlessly within a parent page. Iframes are commonly used for integrating third-party widgets, advertisements, or interactive elements without requiring full page reloads.
Developers should use HTML iframes when they need to embed external content or applications into a web page while maintaining separation of contexts, such as for embedding YouTube videos, Google Maps, or payment gateways. It is particularly useful for creating modular web applications where different sections can load independently, but caution is needed due to security considerations like cross-origin restrictions and performance impacts.