The Google Apps (or GApps as they are commonly referred to) are the proprietary applications by Google included in many Android devices. Most of the applications can now be found and updated via the Google Play Store.
Some of the apps include are: the Google Play Store itself, Google Talk, Google Sync (for adding and synchronizing Google accounts), Google Backup Transport, Car Home, Gmail, Google Maps, YouTube, Google Search, Google Voice Search, Google Music, and Google Docs.
Other Google apps can be easily found on the Google Play Store. You can download the appropriate package for your Android phone or tablet from the list below:
Android 4.2.1 – 4.2.2 – Jelly Bean (for Android 4.2.2 Gapps also)
NOTE: Not compatible with Android 4.1.x.
Android 4.1.1 – 4.1.2 – Jelly Bean
Android 4.0.3 – 4.0.4 – Ice Cream Sandwich
Android 2.3.5 – 2.3.7 – Gingerbread
Android 2.3.4 – Gingerbread
Android 2.3.3 – Gingerbread
Android 2.3.2 – Gingerbread
Android 2.2.0 – 2.2.3