This is where "clients" come in. In the Minecraft community, a "client" usually refers to a modified version of the game with built-in cheats (hacked clients) or quality-of-life improvements (performance clients). For a long time, Eaglercraft players were stuck with "vanilla" gameplay—until developers figured out how to inject external code into the browser runtime.
No. Shadow Client is specifically built for the WebAssembly environment of Eaglercraft. It will not work with the official launcher. shadow client eaglercraft
The Shadow Client comes packed with modules that can be toggled on and off. Here is a breakdown of the most popular features. This is where "clients" come in