The iframe element, introduced in 1997, remains a widely used HTML tag for embedding one HTML document within another, despite its reputation for potential security vulnerabilities and performance issues. The element is valuable for scenarios where separation between the parent and embedded content is needed, such as embedding third-party widgets, videos, or creating isolated environments for content like email templates and WYSIWYG editors. While iframes can still behave unexpectedly, such as triggering pop-ups or autoplaying videos, they can be secured using attributes like sandbox, allow, and referrerpolicy to minimize vulnerabilities. Alternatives to iframes, such as the Fetch API and web components, can be used to dynamically load content without the overhead associated with iframes. Despite some limitations, such as potential impacts on SEO and page loading speeds, iframes remain useful when applied judiciously and securely, particularly when handling content from trusted sources.