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

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.

Sprites are generally 2D images used in games to represent objects. They can be animated or static, and come in different styles like isometric or top-down.

Unity is a game engine for 2D, 3D, AR and more

Unreal Engine is a 3D game creation tool

Resources for building and relating to User Interfaces, how the user interacts with your program