What is the difference between a service and a component? Both should be cohesive and loosely coupled to the rest of application, both should solve a single problem, both have no hard limits on size. The key difference is the boundary.

Comparing to a component, a service:

• does not share memory with other processes
• is not accessed directly — only via a network
• fails independently, without crashing the entire application
• scales independently from the main process or other services

Components are in-process abstractions.
Services are distributed system units.