Imagine we're talking about a person, not software. The interaction between frontend and backend development is similar to the coordinated work of the human body and nervous system. Subcutaneous receptors send information to the brain. It processes the received data and sends a response pulse, causing the body to react.
- Frontend is responsible for how the product looks.
- Backend - for how this product functions.
About communication between clients and servers, or How it works in computer language
There are several clients. Clients can be regular browsers on a computer or mobile device. One of the clients is your computer's browser. You want to get information from the Internet. Make a request: enter your question in the Yandex or Google search engine. A page with the information you need immediately opens.
How does it really work? Your client, aka the browser, sends a request to the server. First, to the user's server - frontend. The frontend server (computer) processes the request, selects a backend server that is currently free, and sends a request to it from the browser. The backend server processes the request, accesses the database, and sends a response to the request back to the frontend server. And the frontend, since it is responsible for user convenience, already displays the response to the request in the form of an HTML page.