Service in AngularJS

• It provides a method to keep data across the lifetime of the Angular app.
• It provides a method to communicate data across the controllers in a consistent way.
• This is a singleton object and it is instantiated only once per application.
• It is used to organize and share data and functions across the application.
• A service is a constructor function.
• You don’t need to return a value.

Syntex: module. service(' ServiceName', function );

Example:

When to use

•  Use it when you just want access to the common data and functionality. In other cases, stick to a factory.
•  Use it when you want to create a simple service. For anything complex, opt for Factories. Because you don’t want to expose this complexity. This is called abstraction.