What are the services, its need and benefits ?

SERVICES

• Service is an object which provides some services like, Utilities, Business logic
  Examples : $http, $log,
• Services can be reused in Controllers, custom Directives and custom Filters.
• Custom services can also be created

NEED OF SERVICE

• Controller should not do all the business logic or a complex logic.
  Instead, it must call different services in order to perform action.

BENEFITS

• Reusability - Reusable in Controllers, Directives and Filters
• Dependency injection - can be injected in Controller
• Easy to Test - Pass mock objects to test services