In Roblox, skins refer to the cosmetic items that players can use to customize the appearance of their avatars. Skins are available for purchase in the Roblox catalog using a virtual currency called Robux, which can be purchased with real money or earned through various means in the game.

Players can choose from a wide variety of skins, including outfits, hairstyles, hats, accessories, and more. Skins are created by the Roblox community, which means that there are constantly new skins being added to the catalog.

Some popular skins in Roblox include those based on popular movies, TV shows, video games, and other media. For example, there are skins inspired by Star Wars, Marvel, Minecraft, and more.

In addition to purchasing skins from the catalog, players can also create their own skins using the Roblox Studio. This allows players to customize their avatar's appearance with unique designs and personal touches.

Overall, skins are a popular way for players to express their creativity and individuality in Roblox while also enhancing their gameplay experience.