Real-world trading is the act of trading anything outside of RuneScape for RuneScape items or services, or vice versa. mmors.com where sell cheap RS Gold will give you simple introduction of it.

Every item in RuneScape is the property of Jagex, and can not be regarded as personal property of the player. Players who conduct Real-world trading violate rule 12, and risk being permanently banned without warning. Personal sellers and companies are the two general kinds of real-world traders.

Personal sellers are people who exchange virtual items and real money on their own behalf. Larger groups and companies are engaged in this practice via websites and on a more public and formal basis. Both kinds of real-world trading are considered violations of rule 12 and are treated identically by Jagex.