In Angular, components and services have different purposes:
Why Use a Service?
Shared Logic: Services are applied to encapsulate and share logic (e.g., data fetching, business logic) between different components.
Reusability: Services enable reusability of code by housing functionality that may be injected in any component.
Separation of Concerns: Services enable business logic to be separated from presentation logic, so components remain slim and UI-centric.
State Management: Services can cache data or hold application state, minimizing duplicate API calls.
Dependency Injection: Services are injectable, allowing them to be easily tested and mocked.