How to Create Key store File ?

Before Upload and Publish Your Application to Google Play. You need to Certified Your Application With Key store file. You Also need to Sing it before Publish. it's a Easy to Create. Follow this Step. I'm Using Eclipse for Make this tutorial. 

What is Android ?

With Google's Andy Rubin announcing that there are now 500,000 activations of Android devices per day, it's clear that Google's operating system has hit the big time. However, despite shops such as Phones4U advertising "Latest Android handsets" for the release of phones like the Sony Ericsson Xperia Arc, LG Optimus 2X and HTC Wildfire S, many people are still left asking, "What is an Android phone? And what is an Android tablet?"

Android is an operating system for mobile phones and tablets, in much the same way that PCs run Microsoft Windows as their operating system. It's maintained by Google, and comes in a few different versions. At the time of writing, mobile phones run a variant of version 2 of Android, while most new tablets run a variant of version 3.