What is the diference of a frontend and backend language?

Answer 1

The code for frontend languages is sent to the user's computer, which then runs the code.

The code for backend languages runs on the server computer, which then sends the output to the user's computer. The user can't see the code itself. Backend code can save and edit things on the server.

Answer 2

Front-end is GUI work.The front-end is everything involved with what the user sees, including design and some languages like HTML and CSS.
The back-end, or the "server-side", is basically how the site works, updates and changes. This refers to everything the user can't see in the browser, like databases and servers. Usually people who work on the back-end are called programmers or developers. Back-end developers are mostly worried about things like security, structure and content management.