Some Qlik Gurus would not condone this approach for embedding Qlik Sense into web apps. However, the single configurator is the most comfortable and most straightforward way to integrate objects, or even full sheets, into another website or platform without having to write any code at all. It doesn't require any technical preparation or knowledge, as you are effectively only embedding a URL into an iFrame.
In short, an iFrame is an HTML document that is embedded inside another similar document on a website.
There are specific scenarios when using an iFrame within your pages is fine, such as when you have relatable, externally hosted content you wish to have on your page, as in the case of the Qlik Sense app.
However, ...