Services (do STUFF) #

They are classes where you can put business logic for components. They should be specific. Components and services should be as reusable as possible. This is a good, short read about them: Services and DI.

According to that page linked above:

A component can delegate certain tasks to services, such as fetching data from the server, validating user input, or logging directly to the console

Creating them #

You usually create one in a .service.ts file. It is an exported class with functions which perform the required business actions. It can then be injected into the required classes. It might depend on other services too.

Providers tell injectors how to obtain or create the required dependencies.

Using them #

Services don’t just need to be provided in modules or the root, it’s also possible to provide a service object just for a component by setting the providers property in the component metadata.

Read more about dependency injection here.