Why do we need a server in the chain client server database?

Question

Backend

I just started learning about building backend services and wondered: why do I need a server? Why sending queries to the database directly from the client is considered incorrect, and why is another layer of abstraction needed?

Answer 1

Because backend is not a database, and business logic is not data.
But not all tasks require client-server interaction, a server is not needed - do not use it, place the database on the client.