One Design is a term used to describe racing sailboats that are identical in form and rigging, and used to race against one another. Boats are typically mass produced through licensed builders to ensure that they fall within the guidelines for the given one design class.
Similar to the One Design style of racing is the Box Rule racing sailboat, and in locations where there are many different types of boats entered into the same race the boats will be assigned a handicap rule to level the playing field for all boat types.
There are currently over 250 one design classes recognized by the United States Sailing Association. The one design classes are are popular as a way for young, inexperienced sailors to get into racing for a more reasonable price and still be able to sail with more experienced sailors. Some popular or historically significant classes are listed below.