What are the main differences in Android 4 ICS and Android 2.3 GGB

[#1]

I would like to know what are the main differences between these two android versions and the advantage of GGB.

In terms of RAM space, which version has more?

Your help will  be greatly appreciated

[MarlonUk1 · Accepted solution]

Here you go mate : http://developer.sonymobile.com/wp/2012/03/30/learn-about-the-technical-differences-between-gingerbr...