Confused: "Service"?

I became very confused when I heard the word "service" used with these agencies:

     Canada Revenue 'Service' Canada Postal  'Service' Telephone 'Service' Cable TV 'Service'  Civil  'Service' City & Public 'Service' Customer 'Service'
This is not what I thought 'service' meant. 
But today, I overheard two farmers talking, and one of them said he had hired a bull to 'service' his cows. 
 
 BAM!!! It  all came into focus. 

Now I understand what all those agencies are doing to us.  

 

 

 

Thanks Ivan