A widget gives you an at-a-glance view of an app when placed on a home screen. An example would be a widget of a weather app, giving you brief information of the current weather.
Hard to say as there's little information on the subject. That being said, there is an app on Google Play (PPP Widget) which would allow you to connect to a 3G dongle/stick, regardless if you have a wifi-only Nexus 7, or one with a SIM. You will need to be rooted however for the widget to work for you.
There are various types of Nexus devices, but the Nexus 7 is part of that same family.
The 2012 Nexus 7 came out on July 2012. The 2013 Nexus 7 came out on July 2013.
The 2012 Nexus 7 debuted on July 2012. The 2013 Nexus 7 debuted on July 2013 (August 2013 in Canada).
Yes, the Nexus 7 (2013) is Bluetooth Smart Ready certified. The 2012 Nexus 7 supports traditional Bluetooth.
The Nexus 7 is an Android Tablet made by Google. It has a screen size of 7 inches.
In the 2012 Nexus 7, it came with a single camera (in the front). The 2013 Nexus 7 has two cameras, one in the front and one in the back.
Nexus 7 tablet 2013 Has a front and rear Camera.
Yes, the Nexus 7 comes in LTE versions.
The Nexus 7 is the better tablet.
The 2012 Nexus 7 had a soft leather back. The 2013 Nexus 7 went for a harder shell with a soft touch-coated plate.
No, the Nexus wireless charger does not have an internal battery. It requires the micro USB charger for it to wirelessly charge a Nexus 7 (or Nexus 4 or 5).