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This android tutorial talks about Intents in detail:
Read more about Android Intent at :

http://www.edureka.co/blog/android-tu...

Android Intent Details :
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Intents can be simply defined as synchronous messages by which one Android Component can request functionality of other component.
An intent can even open a web-browser for you. Any activity can send an intent by which new activity can be started.

Sample code -
Intent intent = new Intent(MainActivity.this, SecondActivity.class);
startActivity(intent);

Suppose on your Facebook Account you are on the news feed screen (which is one Activity), and want to view a pic posted by our friend. When you click on the photo, the intent associated with the click event of photo is fired which communicates the message, and the Photo page opens (which is a new Activity).


***Think of intent as a message to communicate an action. It is a description of what you want done, example: VIEW VIDEO, PLAY GAME etc.

***They are commands which when called would act as communicators between the three core components of Android, i.e. Activities, Services and Broadcast Receivers.

***While you are interacting with one activity, you might want to switch to another one; this is done by defining a proper Intent for the action. Here one Activity uses Intent to request the launch of another Activity. Thus, it is evident that using intents, one Android component can request action from the other components of Android.

Intent Types
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Delving further, Intents can be Explicit or Implicit.

----Explicit Intent:

An Explicit Intent is exactly what it means literally: an "explicit intention" to perform an action. Simply put, in this case, we define explicitly the Android component (Activity, Service or Broadcast Receiver) that needs calling.

----Implicit Intent

Here we do not specifically define the component that needs to be called. However, the Intent contains enough information to direct the system to fetch the correct one.

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