Rails (or ribs), are narrow strips of plastic or metal that are attached under the deck lengthwise along the edges. They are used for additional grip for grabs, and to enhance sliding while protecting the deck's graphics at the same time. Rails also provide a more consistent feel for slides, as the slide of a regular skateboard will suffer from the wear of the paint or varnish on the bottom of the board. Although rarely used anymore, they are useful for experienced skaters that are capable of grabs.
Smile and wave – Feel free to look around at all the other people at the skatepark that stood by and marveled at your new-found accomplishments (all one of them). I’m sure by this point you’ll be picking up roses that are being thrown at your feet, and taking a well-deserved bow as they begin to chant your name. Take it all in, thank the crowd for their undying affection, and then go get a snow-cone. You deserve it, champ.