In short,
The front end covers the appearance of a website, including the UI and the animation.
The Back end covers part of a website that can't be seen by the client that runs on the server and receives requests from the clients and send appropriate data back to the client.
The full-stack is both the front end and the backend.
Front end developer means the developer who develops front end
Back end developer means the developer who develops back end
Full-stack developer means the developer who develops both front end and back end
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In short,
The front end covers the appearance of a website, including the UI and the animation.
The Back end covers part of a website that can't be seen by the client that runs on the server and receives requests from the clients and send appropriate data back to the client.
The full-stack is both the front end and the backend.
Front end developer means the developer who develops front end
Back end developer means the developer who develops back end
Full-stack developer means the developer who develops both front end and back end