Iframe
An iframe (inline frame) is an HTML element that allows embedding another HTML document within the current page, creating a nested browsing context. It is commonly used to integrate external content such as videos, maps, advertisements, or third-party widgets seamlessly into a web page. Iframes enable content isolation, where the embedded document operates independently with its own CSS, JavaScript, and DOM.
Developers should use iframes when they need to embed external or third-party content without affecting the main page's structure or security, such as for embedding YouTube videos, Google Maps, or social media widgets. They are also useful for creating sandboxed environments to isolate untrusted content or for building micro-frontend architectures where different parts of a web application are developed and deployed independently. However, iframes should be used judiciously due to performance and accessibility considerations.