What is context in android?
This question already has an answer here:
This was asked and answered several times.
Please see this question: What is Context in Android? and the accepted answer: https://stackoverflow.com/a/3572553/1820695
For differences between various Context accessor methods ( getApplicationContext() , getBaseContext() , this in Activity , etc.) see this question: Android - what's the difference between the various methods to get a Context?
If we go by the documentation
Interface to global information about an application environment. This is an abstract class whose implementation is provided by the Android system. It allows access to application-specific resources and classes, as well as up-calls for application-level operations such as launching activities, broadcasting and receiving intents, etc.
In Simple words its the context of current state of the application/object. It lets newly created objects understand what has been going on. Typically you call it to get information regarding another part of your program (activity, package/application)
For the difference between getApplicationContext() and getBaseContext() please refer this
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