In many games – especially Massive Multiplayer Online (MMO) games – players collect digital items to further their progress. These can include in-game objects like weapons, property or wearables. They’re usually earned as rewards for completing quests and challenges, or acquired from loot boxes bought with real currency. From various skins to in-game currency, items let gamers customize their characters with new outfits and better equipment, but none of these can be sold to other players for cash.
Source: https://www.coindesk.com/learn/how-to-pick-the-right-play-to-earn-game-for-you/