Explain what is services in AngularJS ?

In AngularJS services are the singleton objects or functions that are used for carrying out specific tasks.  It holds some business logic and these function can be called as controllers, directive, filters and so on.

Service helps to implement dependency injection. For instance let’s say we have the below “Customer” class who needs “Logger” object. Now “Logger” object can be of “FileLogger” type or “EventLogger” type.

function Customer($scope,$http, Logger)
{
        $scope.Logger = Logger;
}

So you can use the “service” method of the application and tie up the “EventLogger” object with the “Logger” input parameter of the “Customer” class.

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var app = angular.module("myApp", []); // creating a APP
app.controller("Customer", Customer); // Registering the VM
app.service("Logger", EventLogger); // Injects a global Event logger object

So when the controller object is created the “EventLogger” object is injected automatically in the controller class.