Mojang Mappings
Mojang mappings are the official names provided by Mojang for Minecraft’s obfuscated classes, fields and methods.
Differences to Yarn
Section titled “Differences to Yarn”- Official Recognition: Uses exactly the same names Mojang uses in their source code
- No parameter names: Mojang mappings generally do not include method parameter names or Javadocs. Yarn on the other hand, includes documentation for a lot of methods