Can FE only work in a browser? Why? (Provide a brief justification for your answer)

Frontend (FE) does not necessarily only operate in the browser. Although traditionally, the frontend is the part of the application that interacts with the user through the browser, modern technologies allow running frontend code outside the browser, for example, in environments like Electron or React Native. The main thing is that the frontend is responsible for displaying the interface and interacting with the user, not for a specific platform.