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Thanks for clearing it up! CheersHe's using optifine with shaders. You have to download optifine for whatever version of the game you play on and install it. Then you have to find a shader pack you like and move it into your optifine shaderpacks folder. After that, you can turn it on through the optifine shader settings in-game.
I don't have any particular recommendations for shaders as I don't use them but there's a ton of showcases on youtube.