Google apps or Gapps as they are referred to, play an important role in the Android Ecosystem especially if the smartphone user is running the device in custom. The Pack of Google Apps contains all the Google Services which act as the middleman between the Google Server and your smartphone. To sum it up, we can say that without Google Play Services which is a fraction of the Gapps package, you will not be able to use any of the Google Apps including Google Play Store. Your Gapps package not only includes basic applications like Google Chrome, Hangouts, YouTube, and many more apps. There is a variety of Gapps packages. They range from as less as 50 MB to as huge as 400 MB. There are packages like Nano pack, Pico pack, Mega pack, and full pack. The Pico Google Apps pack is the smallest Google Apps package available. In this pack, you will get the Google Play Store as well as Google Play Services. It is highly recommended for those users who do not like additional bloatware. You can download this app, then use the Google Play Store to download only those apps which you tend to use on a daily basis. Download Pico Gapps | Android Marshmallow Pico Apps pack for Android 6.0.1
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How To Install Full GApps (Marshmallow ) On Android Via TWRP Recovery
First, download the right GApps Pack For your device. Now follow the linked guide to Install Gapps Via TWRP Recovery