Is there a diagram or big picture idea that shows the relationship between components, services, the backend routes, and database?

How do they respond to one another after a user clicks an event.

An example:

User enters username, password and clicks submit on login html form.

how does req, res work when going through login component to authentication service, to the backend route, to the database?

Is there an overall picture or an idea to help me understand how things are connected? I don't need actual code i just need the idea behind how they respond to one another in simple terms

via hrrysn