Yes, the frontend and backend are "friends" in the sense that they work together to create the full functionality and usability of a web application. The frontend is the part of the application that is visible to the user and is responsible for the user interface and its interactions. The backend, in turn, is the part of the application that is invisible to the user and is responsible for business logic, data storage and data processing.
Frontend and backend are interrelated and complement each other. The frontend communicates with the backend through an API (application interface) to obtain the data and information that is necessary to display the user interface. The backend, in turn, communicates with the frontend to send information and data that is displayed on the frontend.
In this way, the frontend and backend together create a coherent and functional web application that is user-friendly and allows the implementation of business tasks and goals.