API - application program interface. Related Terms. Application program interface (API) is a set of routines, protocols, and tools for building software applications. An API specifies how software components should interact. Additionally, APIs are used when programming graphical user interface (GUI) components. A good API makes it easier to develop a program by providing all the building blocks.
By Rowena Pedrena. A traditional golf set has 13 clubs: three woods, nine irons (including three wedges) and one putter. The USGA limits the number of clubs a player may carry in his or her bag to 14. A player may include an additional wedge or wood to a fill a gap in hitting distance.
On behalf of all golfers, both Amateur and Professional, the USGA conducts three Open Championships each year -- Women's, Men's, and Senior Men's - and ten Amateur Championships. The PGA is the Professional Golf Association that represents the Professional Golfers in the country. The PGA sponsors many tournaments for its professional players, which are open only to professionals.