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Typically small graphics that can be used to represent something, like items or actions

Massively Multiplayer ; Online ; Role Playing Game. This subgenre of games are meant to be played with many others people through the Internet, either friends or strangers.

PNG, or Portable Network Graphics is a common image file format that is lossless, can contain an transparency channel, and compressed. An ideal format for distributing static assets without any loss in quality.