Cloth diapers

I really want to cloth diaper but as soon as I think "okay I got this" I get confused lol so I want to use a variety of diaper types but mostly prefolds. I went on eBay and Amazon to look at covers specifically for prefolds and the majority of what I'm seeing are covers like this:
This doesn't look like it's meant for prefolds, is it? If not is it just meant for inserts? I'm confused please help lol