At one time in my life, I thought I had a handle on the meaning of the word "service." The act of doing things for other people.

Then I heard the terms:

Internal Revenue Service
Postal Service
Civil Service
Service Stations
Customer Service
City/County Public Service

And I became confused about the word "service."  This is not what I thought "service" meant.

Then one day, I overheard two farmers talking and one of them mentioned that he was having a bull over to "service" a few of his cows.

SHAZAM!! It all came into perspective.