This type you can mount to the wall or door simply by screwing it in. Hinge pin- usually brass. You remove the hinge pin in your door and insert door stop, then reinsert the hinge pin. This type is easily adjusted to limit door opening. The hinge pin is good to use when it is not appropriate to install a doorstop into the door or wall.
Floor mounted- usually brass.
It comes in different styles. It also has a rubber tip to protect the door. It is decorative and sometimes antique. You place it in front of your door to keep it open or shut. A good place to purchase this type of doorstop would be an antique mall, flea market, or auction.