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32 pixels by 32 pixels is a common resolution for assets matching a low-res pixel art aesthetic. Although the assets may not be specifically 32x32, they are designed to work in a graphical setting where objects are around that size.

A collection or bundle of assets together as a single download or purchase

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.