Skin

A Skin refers to the texture that is placed onto a player model or mob.

The skin is divided into areas that act as the surface area of the character (For example, there's the front head area, left leg area, etc.). A skin will only allow solid color; transparency is not allowed on the skin file except on the second head area, which is transparent by default. The second head layer can be used to give the character glasses, hats, or other accessories (even a bigger head).

World Textures
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. Modifying these has been officially supported since the Minecraft Version Alpha 1.2.2 Update on November 10, 2010.

It is worth noting that Pigmen, Zombie, and Zombie Pigmen mobs can use typical player skins (and vice-versa). Skeleton mobs can use typical player skins aswell, but keep in mind that they will still have their skinny arms and legs. (If a skeleton mob skin is used as a player's skin, their legs and arms will NOT be skinny.)

Changing Player Skins
A player can only change their character's skin if they purchased Minecraft. This is done on the Profile page by uploading a valid .png image file, which will then replace the default skin. The char.png file in minecraft.jar can also be changed and replaced, but then, only in that game the player character will appear different, and that is also the case for other people who use the default skin.

Creating a skin
A custom skin is a great way to personalize your player model and can be done either by using a variety of community-made skin editors or by editing Minecraft's char.png file manually. This is stored in the minecraft.jar file and can only be accessed by using an archive decompiler (such as Winzip, Winrar, or 7-Zip).

In Windows, minecraft.jar is located in "C:\Users\User\AppData\Roaming\.minecraft\bin", accessed by pressing + and entering "%appdata%" in the command box. This is done differently on a Mac. On Linux it is in /home/ /.minecraft/bin.

Skin files must be 64 x 32 pixels.

Note: As of the 1.9 pre-releases and 1.0.0, all "bottom" textures (including hand and foot) have been flipped 180 degrees. It's worth mentioning that the textures were specifically flipped and not rotated because an updated texture with the bottom surface rotated as opposed to flipped may display incorrectly depending on the intended alignment with relation to the rest of the skin.

Capes
Capes (previously known as cloaks) are vanity items and are worn in addition to the player's skin. There is currently no way to obtain a cape on one's own, however there are various mods that allow players to do this.

Trivia / Review

 * There are over 3,500 different skins
 * Skins are easy to download
 * You can view your skin by going into minecraft and pressing or
 * It is possible to make skins.
 * The default skin is a brown body with a light blue T-shirt, dark blue pants, and brown hair
 * If two villagers make a baby, it's skin will be the same, only smaller, but it's head will stay the same size
 * Go to Minecraft Skins for a wide collection of many skins
 * Many "Katniss Everdeen" skins were recently created (because of the new movie, "The Hunger Games", released 2012) but to find the most popular click here
 * You will know if you changed your skin if you go into minecraft and either press or empty  your hands and see if your hand color is different