A Rails app is literally one or more Ruby processes whose task is to respond to HTTP requests/WebSocket connections. Yes, these processes will probably make use

A Rails app is literally one or more Ruby processes whose task is to respond to HTTP requests/WebSocket connections. Yes, these processes will probably make use of other services (e.g. a database server). An Angular app is a JavaScript file that runs in a client's JS environment. I don't see how there's considerable overlap here?