This is pretty much the same thing as the file above, but instead of this setting the gemset it sets the ruby version.  This is the for the same reason we talked about yesterday when we set up RVM.  If you don't use the same version in all locations, you can't be sure you'll get the same results.  These files help to make sure that all people on the project use the same ruby version and the same gems.  You'll start to see the value as you dive deeper into programming.