The default player skin, «Steve», as it appears in-game. The alternate default player skin, «Alex», as it appears in-game. This article is about custom minecraft xbox edition youtube skins.
For world textures, see resource pack. Skins refer to the textures that are placed onto a player or mob model. If a skin with transparent pixels on the first layer is uploaded, the transparent pixels will render as black pixels in-game. A skin can also refer to other textures in the game, such as block textures, item sprites, mob skins, etc. A list of these can be found here.