A language workbench is like a magic pen that can help people write computer programs. This magic pen knows a lot of different languages and can help you make the right choices when you're writing code. When you write a program using this magic pen, you don't have to worry about what computer language you are using because the pen will help you use the right one.
Imagine you are a chef and you are cooking a pizza. You have to use different ingredients like cheese, tomato sauce, and dough, but you have to use them in the right amounts or the pizza will not taste good. A language workbench is like a cookbook for computer programming, and it helps you use the right amount of code for the computer to understand what you want it to do. Without a language workbench, you might have to learn a lot of computer languages, but with it, you can start writing code almost right away, and the magic pen will take care of the rest.