These arrangements may be used to offset negative consequences of development, to help meet local needs or to secure benefits which would make a development more sustainable.
Gellir defnyddio'r trefniadau hyn i wrthbwyso canlyniadau negyddol datblygiad, helpu i ddiwallu anghenion lleol neu sicrhau buddiannau a fyddai'n gwneud datblygiad yn fwy cynaliadwy.