First we need to know what is an SDK ? SDK is a software development kit. There are many SDKs like Google Map SDK , Facebook SDK , Twitter SDK etc. Now, if you want to make an Android application that could share something on facebook or twitter, then you will need a Facebook or Twitter SDK for your application. This use of some other sdk in your application is called the Facebook SDK or the Twitter SDK Integration with Android. On the other hand, if you want to make an ios application that can use the google map, then you need to integrate the Google Map SDK into the ios application. This is called SDK integration ... It is. Thank you.