Experience

Experience, or just "xp" for short, is what the player will yield when doing certain actions. This includes mining, combating, fishing, clearing dungeons, burying bones, woodcutting, cooking and so on... The list is long.

The main purpose of getting xp is so that one can level up. The higher the level the more xp can be yielded per time and the more things will be unlocked. Every skill has its unique xp bound to it and the skill's level depends on the amount of xp in that skill. You can read more about the xp required to level up on the Level Curve page.

Double XP
Every last day of the month, double xp is unlocked. This means that on every activity the player will yield twice as much xp as normal. It is normal to stack up on items for skills like summoning, firemaking, fletching, crafting, smithing, etc. to use all ones resources that day to gain the maximum amount of xp from it. This is the icon shown when Double XP is active