It shows the language that the majority of the code is written in. For example, go to https://github.com/twitter/twitter-text-js https://github.com/twitter/twi

It shows the language that the majority of the code is written in. For example, go to https://github.com/twitter/twitter-text-js https://github.com/twitter/twitter-text-js and click on the red bar. More info at https://github.com/blog/1037-highlighting-repository-languages https://github.com/blog/1037-highlighting-repository-languag...