Snowboards come in several different styles, depending on the type of riding
intended (From Wikipedia, the free encyclopedia):
Racing/Alpine: long, narrow, rigid, and directional shape. Best during machine
groomed slopes. Most often ridden with a "hard" boot, but also ridden
recreationally with soft boots, particularly by riders in Europe.
Freestyle: Generally shorter in length with a Semi-directional or twin-tip
shape. Moderate to soft in flex. Incorporates a deep sidecut for quick/tight
turning. Used in the pipe and in the park on various jumps and terrain
features including boxes, rails, and tables.
Park/Jib (rails): flexible and short, twin shaped with a twin flex to allow
easy switch riding, wider stance, with the edges filed dull. Used for
skateboard-park like snowboard parks.