Palm sugar is a sweetener derived from any variety of palm tree. While the sugars from different palms may have slightly different textures and colours, they all are processed in the same way and can be used interchangeably.
The colour of palm sugar can vary from pale golden to dark brown and the texture from soft and crumbly to very hard. Because of its unrefined nature, palm sugar contains vitamins and trace minerals and is less sweet than cane sugar.
Stick it in the cupboard, store in an airtight container once opened.