Iframes give you the ability to serve a lot of information in a small section of your website. Instead of having your whole webpage scroll, you can allow your visitors to scroll through a specified section of your website.
Unfortunately, Iframes aren't too user-friendly, especially for screen readers. Often times, Iframes can be replaced with a simple div.
The pink div below has "overflow: auto;", which means that if the content inside of the div goes beyond the set width or height, the box will then be scrollable.

<div align=left style="width: 300px; border: 1px solid #aaaa55 ;background-color:#f9efef; height:65px; overflow:auto; color:#135; padding:10;">
Så kommer teksten....
</div>