In general, the backend support services provided by the backend include monitoring the performance of the system, identification and resolution of problems, software updates and patches, software integrity, data protection, configuration management, backup, disaster recovery planning, and technical support for users.
It's the server side, commonly known as the backbone of your application, taking care of your web application's overall functionality. When your user is interacting with the frontend, the interaction triggers a request to the backend in HTTP format. After processing this request, the backend will return a response.