Each time you refresh this page, it will show a new set of cats.
If you want to view the full image of the cat, left click (or tap on mobile) and you will be redirected to the image.
If you like a cat, you can right click (or hold on mobile) to pin it to the top of the list.
If you want to unpin a cat, just right click (or hold on mobile) and it will go away.