In a Nutshell WebAssembly has huge implications for the web platform — it provides a way to run code written in multiple languages on the web at near-native speed, with client apps running on the web that previously couldn't have done so.

Code representation It defines a WebAssembly binary format ( . wasm ), which is not designed to be used by humans, as well as a human-readable WebAssembly text format ( . wat ) that resembles a cross between S-expressions and traditional assembly languages.

However, it is important to note that JavaScript is still the most widely-used programming language on the web and it is unlikely to be replaced entirely by WebAssembly. Instead, WebAssembly will likely be used to complement and enhance the capabilities of JavaScript.

WebAssembly operates on a stack-based machine that allows web applications to run near-native speed by using a binary format. It can be generated by higher level programming languages like C++ or C#. The idea is that it runs a lot faster than JavaScript. It's quite efficient, meaning it's fast to load and execute.