STARs
A Standard Terminal Arrival Route (STAR) is an ATC-coded IFR arrival route established for use by arriving IFR aircraft destined for certain airports. Its purpose is to simplify clearance delivery procedures and facilitate transition between enroute and instrument approach procedures. Reference the terminal procedures publication (TPP) for the availability of STARS.
STARS designated RNAV serve the same purpose as conventional STARs, but are only used by aircraft equipped with FMS or GPS. An RNAV STAR or STAR transition typically includes flyby waypoints, with fly-over waypoints used only when operationally required. These waypoints may be assigned crossing altitudes and speeds to optimize the descent and deceleration profiles. RNAV STARs must be retrievable by the procedure name from the aircraft database and conform to the charted procedure.
You are not required to accept a STAR, but if you do, you must be in possession of at least the approved chart. Pilots should notify ATC if they do not wish to use a STAR by placing "NO STAR" in the remarks section of the flight plan, or by the less desirable method of verbally informing ATC.