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What is the difference between backend and frontend engineer

In the job of engineers has two sides.
It’s the backend and frontend.

-What is the difference?

[The backend]

The backend has languages that runs on the server.
You need your Local development environment .
Creating your Local development environment  is not easy.
It’s a hard point of the backend.
langs: Java, PHP, Ruby etc… ;

[The frontend]

The frontend has languages that runs on browser.
You don’t need your server .
It runs fast, and don’t need debug.
langs: HTML, CSS, JavaScript ;
It was a simple description , but I think that you be able to understand what is the difference between the frontend and the backend .