I had a task to renew ssl certificates on a few websites, all went well I tested and was about to close the task when I noticed:

#if on nginx prepare your certificate by combining the two files given to 
#you by godaddy
cat yourdomain.com.crt gd_bundle.crt > yourdomain.com_combined.crt

This was not mentionned on godaddy's website per se, but I found it in other threads so I did as suggested above, but did not see any noticeable difference.

I am curious as to what difference there is in combining the two .crt, verses just using the one .crt file?