About Android versions:

Android versions have so much kiddish names as they were initially thought to be developed for kids and also they are in alphabetical order and thus easy to use.

Version name with version numbers:

Beta:  Android 1.0
Cupcake:  Android 1.5
Donut:  Android 1.6
Eclair:  Android 2.0,Android 2.1
Froyo( short for “frozen yogurt” ) :  Android 2.2
Gingerbread:  Android 2.3
Honeycomb:  Android 3.0, Android 3.1,Android 3.2
Ice Cream Sandwich:  Android 4.0
Jelly Bean:  Android 4.1,Android 4.2,Android 4.3
KitKat:  Android 4.4
Lolipop:  Android 5.0,Android 5.1

Will Explain all the version one by one :

1. ANDROID BETA:

The very first version of android for the world was android beta,
then where is the alphabetical order?
Where is A for apple??
I thought the same but android A or say android alpha was not launched in market, it was just developed and used only under google, why?
Obviously if I am going start a new project or I am going to develop something new I would face some challenges also would make some mistakes and so did they.Then android A went under development and finally came up with a new face called android beta which was released on November 5 2007, a week before the launch of android SDK.
And so android celebrate its birthday on November 5, and its birthday gift is your happiness.

FEATURES BETA:

Android beta had every basic features that we have now in newer versions like wi-fi ,bluetooth, Gmail ,maps, google search, g talk and all, a unique feature in it was a market of our own which is now commonly known as Playstore now a days.

2. ANDROID CUPCAKE:

First android version had many bugs in its API(application programming interface) level and so was more developed. Then Android developed more into “beta” and came up with a new android with a new API called Android cupcake,in which we found some new features like installing 3rd party keyboards, on-screen Widgets, uploading on YouTube and Picasa, copying and pasting, auto rotation, video recording, boot animation and other animations.

Click here for government certification in Information Technology