How to embed a another webpage inside a column on a main page

I can use iframe to get what I want almost, but not sure this is the recommended way to do this. I’d like to make the web page displayed dynamic as I have their urls as fields in a database. Read a post about this hinting of a routing functionality but not sure where to find that.

Thanks
Rick

Please check the docs about serverside includes: Server Side Includes (SSI)