My favourite phrase here is "distributed systems", and that includes any system with discreete components that communicate over a network internally (i.e. consu

My favourite phrase here is "distributed systems", and that includes any system with discreete components that communicate over a network internally (i.e. consuming a third-party API does not count; obviously there would always be some gray areas). And yes, a simple SPA is a distributed system, even if the backend is a monolith.