It is a visualization of firsttags in stackowerflow.com sorted by the number of questions asked against each tag from beginning to 1/1/2014.tops with highest number of question followed by.The left side bar-chart helps to sort it out clearly with its number of questions

java

android : 64043

swing : 34189

eclipse : 21011

spring : 19241

hibernate : 15605

multithreading : 12015

xml : 11153

jsp : 10655

.... etc

php

.net

c

c++

The chord-chart tells you how these tags are related to each other, means if a question is tagged with two or more tags they are related to each other.All questions are tagged with their subject areas. Each can have up to 5 tags, since a question might be related to several subjects. So in data related tototal number of questions asked isamong thatquestions are tagged androidI took the first 60 tags and each tags first 60 related tags. So its not necessary that all are related to each other for example in the first 60 list ofwe cannot find anyor