Difference between Next Generation Firewall (NGFW) and Unified Threat Management (UTM)

Hello Everyone !!! Hope you all are doing fantastic. A lot of people has hold confusion in  UTM and Next Generation Firewall  (NGFW), recently I came across a very good explanation and I hope it helps you in opening up your mind. For more detail click on the below link
http://blog.anitian.com/utm-v-ngfw-a-single-shade-of-gray/