This is REAL-L, it is 1024X1024 which means that every surface of a block has 1,048,576 pixels. 1 block has 6 sides so that mean you multiply and get 6,291,456 PIXELS PER BLOCK! Isn’t that just AMAZING!
For the one who’s thinking REALL isnt correct! It means Real Life!
How to Install RealL (Light) Texture Pack for Minecraft
In order to use HD texture packs properly (32× and higher) you will need to either patch your Minecraft using MCPatcher or using OptiFine. Optifine is preferred as it includes all of the features of MCPatcher, and greatly increases game speeds and graphics settings. MCPatcher tends to be updated on the same day as Minecraft updates, so use it instead if you are in a hurry.