In the context of The Sims 4 and similar games, a (often referred to as a "Default Replacement") is a type of custom content (CC) that overrides the game's original face textures or templates. Unlike standard CC that appears as a new option, these modifications automatically apply to all existing and newly generated Sims in your game world. Overview of Face & Skin Replacements

: These override the vanilla "pudding face" textures with more detailed, realistic, or "Maxis Match" (cartoonish but refined) textures.

Based on community consensus from Patreon and EA Forums , here are several top-rated options: Please explain Skin Overlay, Skin Mask, Normal Skin, Etc